US3774986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording superimposed holograms
Assignee: CO GEN ELECTRICITE
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Filing: 1972-11-02
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Granted: 1973-11-27
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Expires: 1992-11-02
Abstract
Abstract Where superimposed holograms are produced on the same photosensitive element by recording the interferences of two coherent beams comprising a reference beam and an object beam with each reference beam being, for each object, in a different direction from the preceding ones in relation to the photosensitive element and achieved by successively rotating the same light beam, the same beam and said object beam are subjected respectively to a rectilinear polarization in a predetermined direction and the rectilinear polarization directions of the object and reference beams are subjected to a rotation identical to that of said same beam.
Inventors
- 👤 J Bourgoin
- 👤 J Budin
- 👤 R Lenfant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:45
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/26; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
120 words
In a method for producing superimposed holograms, on the same photosensitive element, of several objects by recording the interferences of two coherent beams, a reference beam and an object beam coming from each object to be holographed, each reference being, for each object, in a direction different from the preceding ones in relation to the said photosensitive element, the various directions being obtained by successive rotations of a same light beam, the improvement comprising: providing for said same beam and object beam, respectively, a rectilinear polarization in a determined direction, and subjecting, for each rotation of that same light beam, the rectilinear polarization directions of said object and reference beams to a rotation identical to that of the same beam.
Claim 2
Dependent Claim
120 words
In a method for producing superimposed holograms, on the same photosensitive element, of several objects by recording the interferences of two coherent beams, a reference beam and an object beam coming from each object to be holographed, each reference being, for each object, in a direction different from the preceding ones in relation to the said photosensitive element, the various directions being obtained by successive rotations of a same light beam, the improvement comprising: providing for said same beam and object beam, respectively, a rectilinear polarization in a determined direction, and subjecting, for each rotation of that same light beam, the rectilinear polarization directions of said object and reference beams to a rotation identical to that of the same beam.
Claim 3
Dependent Claim
18 words
The method according to claim 1, wherein the polarization directions of the object and reference beams are parallel.
Claim 4
Independent Claim
170 words
A device for producing superimposed holograms on the same photosensitive element, comprising: a source of coherent light beam, an optical separator to give rise to a first beam and a second beam, originating from said source beam, means for illuminating one of the said objects from the first beam, said illuminated object giving rise to an object beam, said second beam constituting the reference beam, means for directing said reference beam on at least a part of the path of the object beam, means for polarizing rectilinearly said object beam and said reference beam, means for changing the direction, by rotation of said reference beam for each object to be holographed, means for subjecting the rectilinear polarization direction of said object and reference beams to a rotation identical to that of the said reference beam when the latter is subjected to a rotation, said photosensitive element having a memory being arranged in the common part of the paths of the said object beam and reference beam in a determined position.
Claim 5
Independent Claim
170 words
A device for producing superimposed holograms on the same photosensitive element, comprising: a source of coherent light beam, an optical separator to give rise to a first beam and a second beam, originating from said source beam, means for illuminating one of the said objects from the first beam, said illuminated object giving rise to an object beam, said second beam constituting the reference beam, means for directing said reference beam on at least a part of the path of the object beam, means for polarizing rectilinearly said object beam and said reference beam, means for changing the direction, by rotation of said reference beam for each object to be holographed, means for subjecting the rectilinear polarization direction of said object and reference beams to a rotation identical to that of the said reference beam when the latter is subjected to a rotation, said photosensitive element having a memory being arranged in the common part of the paths of the said object beam and reference beam in a determined position.
Claim 6
Dependent Claim
18 words
The devicE according to claim 3, wherein: said separator is constituted by a partially transparent and reflecting surface.
Claim 7
Dependent Claim
20 words
The device according to claim 4, wherein: said surface is constituted by the separating diopter of two prisms fixed together.
Claim 8
Dependent Claim
43 words
The device according to claim 3, wherein: said means for illuminating one of the said objects comprises a zero vergency lens and a ground glass arranged behind the said lens so that the light diffused by that ground glass illuminates the said object.
Claim 9
Dependent Claim
44 words
The device according to claim 3, wherein: said means for directing said second beam onto the object beam comprises at least one reflecting surface, reflecting the said second beam emerging from the separator, on a part of the path of the said object beam.
Claim 10
Dependent Claim
61 words
The device according to claim 3, wherein: said means for polarizing rectilinearly said object beam and reference beam comprise a first quarter wave plate, said source of coherent light sends out a beam of circularly polarized light, and said quarter wave plate is arranged on the path of the said beam of coherent light before it crosses through the said separator.
Claim 11
Dependent Claim
39 words
The device according to claim 8, wherein: said source of circularly polarized light comprises a laser generator sending out a beam of rectilinearly polarized light and a second quarter wave plate arranged at the output of the said generator.
Claim 12
Dependent Claim
40 words
The device according to claim 3, wherein said means for changing the direction of the said reference beam by rotating, comprise said separator and reflecting surface connected with means for subjecting them to rotations having the same amplitude and direction.
Claim 13
Dependent Claim
71 words
The device according to claim 10, wherein: said means for subjecting the rectilinear polarization direction of said beams to a rotation identical to that of the reference beam when the latter is subjected to a rotation, comprises said first quarter wave blade connected with the said separator and reflecting surface and means subjecting said blade, said separator and said reflecting surface to rotations having the same amplitude and the same direction.
Claim 14
Dependent Claim
27 words
The device according to claim 3, further comprising at least an optical delay contrivance arranged on one of the paths of the said first and second beams.
Claim 15
Independent Claim
165 words
A device for producing superimposed holograms on the same photosensitive element comprising: a fixed base, a generator fast with said fixed base generating a rectilinearly polarized beam and a first quarter wave plate arranged at the output of the said generator and fast within a support which is mobile in relation to the said base, a source of coherent light beam, a second quarter wave blade, an optical separator dividing said source beam which has crossed through the said second quarter wave plate into a first and second beam, means for illuminating an object in a fixed position in relation to the said base, by the first beam, and at least one mirror fixed on the said support for deviating the said second beam on the path of the beam emerging from the said object illuminated by the said first beam, and said photosensitive plate being arranged in the part common to the said preceding beams in a fixed position in relation to said base.
Claim 16
Independent Claim
165 words
A device for producing superimposed holograms on the same photosensitive element comprising: a fixed base, a generator fast with said fixed base generating a rectilinearly polarized beam and a first quarter wave plate arranged at the output of the said generator and fast within a support which is mobile in relation to the said base, a source of coherent light beam, a second quarter wave blade, an optical separator dividing said source beam which has crossed through the said second quarter wave plate into a first and second beam, means for illuminating an object in a fixed position in relation to the said base, by the first beam, and at least one mirror fixed on the said support for deviating the said second beam on the path of the beam emerging from the said object illuminated by the said first beam, and said photosensitive plate being arranged in the part common to the said preceding beams in a fixed position in relation to said base.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |