US3860950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for recording and reading out holograms on black-and-white film
Assignee: Agfa Gevaert AG
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Filing: 1972-01-28
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Granted: 1975-01-14
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Expires: 1992-01-28
Abstract
Abstract Holograms of frames of motion picture color film are exposed on black-and-white film which is thereupon developed and bleached (if necessary) prior to introduction into a reading apparatus. The recording apparatus employs a single laser or a set of discrete lasers for the production of a coherent light beam having three different wavelengths, a grating having two linear color grating components extending across the path of the coherent beam, a transporting mechanism for placing discrete frames of an original color film into register with the grating so that the grating and the frame in register therewith modulate the beam, and means for utilizing the modulated beam for exposing holograms (preferably sets of three superimposed holograms) on black-and-white film.
Inventors
- 👤 Richard Wick
- 👤 Friedrich Bestenreiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:44
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/26
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
114 words
A method of producing of sequence of holograms of original film frames on photosensitive material comprising the step of placing discrete frames of original material comprising a color film in which a plurality of colors are superimposed in each of said frames into register with at least one linear color grating, directing a first portion of a first beam of coherent light having a plurality of wavelengths against said discrete frame, modulating said first portion of said first beam by said grating and said frames, thereby producing a second beam, and utilizing said modulated second beam in conjunction with a second portion of said first bEam to form a hologram on a photosensitive material.
Claim 2
Independent Claim
114 words
A method of producing of sequence of holograms of original film frames on photosensitive material comprising the step of placing discrete frames of original material comprising a color film in which a plurality of colors are superimposed in each of said frames into register with at least one linear color grating, directing a first portion of a first beam of coherent light having a plurality of wavelengths against said discrete frame, modulating said first portion of said first beam by said grating and said frames, thereby producing a second beam, and utilizing said modulated second beam in conjunction with a second portion of said first bEam to form a hologram on a photosensitive material.
Claim 3
Dependent Claim
28 words
A method as defined in claim 1, wherein said coherent first beam has three different wavelengths and said grating comprises two components of different spatial frequencies and colors.
Claim 4
Dependent Claim
17 words
A method as defined in claim 2, wherein the colors of said components are yellow and blue-green.
Claim 5
Dependent Claim
47 words
A method as defined in claim 1, wherein said utilizing step comprises passing differently colored component beams of said modulated second beam through discrete transformation lenses whose focal planes coincide with the plane of that frame of the original film which is in register with the grating.
Claim 6
Dependent Claim
33 words
A method as defined in claim 1, wherein said utilizing step comprises superimposing on black-and-white film a plurality of holograms for each of said frames, one for each wavelength of said first beam.
Claim 7
Dependent Claim
18 words
A method as defined in claim 1, wherein the utilizing step comprises forming a hologram on black-and-white film.
Claim 8
Dependent Claim
22 words
A method as defined in claim 1, further comprising the step of reconstructing the images of said discrete frames from said holograms.
Claim 9
Dependent Claim
40 words
A method as defined in claim 7, further comprising the step of utilizing a television tube with an electron beam to scan said reconstructed image along lines extending substantially at right angles to the lines of said linear color grating.
Claim 10
Dependent Claim
132 words
In an apparatus for producing a sequence of holograms of original film frames on photosensitive material, a combination comprising means for producing a first beam of coherent light having a plurality of wavelengths; a grating having at least one color grating component extending across the path of a first portion of said first beam; means for placing discrete frames of an original color film in which a plurality of colors are superimposed in each of said frames into register with said grating so that said grating and the film frame in register therewith modulate said first portion of said first beam to produce a second beam; and means for utilizing said modulated second beam in conjunction with a second portion of said first beam to form a hologram on a photosensitive material.
Claim 11
Dependent Claim
132 words
In an apparatus for producing a sequence of holograms of original film frames on photosensitive material, a combination comprising means for producing a first beam of coherent light having a plurality of wavelengths; a grating having at least one color grating component extending across the path of a first portion of said first beam; means for placing discrete frames of an original color film in which a plurality of colors are superimposed in each of said frames into register with said grating so that said grating and the film frame in register therewith modulate said first portion of said first beam to produce a second beam; and means for utilizing said modulated second beam in conjunction with a second portion of said first beam to form a hologram on a photosensitive material.
Claim 12
Dependent Claim
45 words
A combination as defined in claim 9, wherein the means for producing said first beam comprises three discrete lasers each arranged to produce a beam of a different color, and means for superimposing said discrete beams upon each other to thus produce said first beam.
Claim 13
Dependent Claim
81 words
A combination as defined in claim 9, wherein said utilizing means comprises means for splitting said modulated second beam into discrete component beams of different wavelengths, a plurality of lenses each located in the path of a different discrete component beam and each having a focal plane coinciding with the plane of that film frame which registers with said grating, and means for superimposing said discrete component beams upon each other to form a third beam which impinges upon black-and-white film.
Claim 14
Dependent Claim
83 words
A combination as defined in claim 11, wherein said splitting means comprises a dichroic beam splitter and the focal lengths of said lenses satisfy the equation fr lambda c/ lambda r . fc; fg lambda c/ lambda g . fc; fb lambda c/ lambda b . fc wherein lambda c is the wavelength of the readout beam, fc is the focal length of the reconstruction lens, and lambda r, lambda g, and lambda b are the wavelengths of the respective discrete component beams.
Claim 15
Dependent Claim
80 words
A combination as defined in claim 9, wherein said utilizing means comprises means for splitting said modulated second beam into discrete component beams of different wavelengths, a plurality of lenses each located in the path of a different discrete component beam and each having a first focal plane coinciding with the plane of that film frame which registers with said grating, and a second focal plane which is parallel to, but deviates slightly, from the plane of said photosensitive material.
Claim 16
Dependent Claim
33 words
A combination as defined in claim 13, wherein the deviation in distance between the second focal plane and the plane of said photosensitive material is about 10 percent of the respective focal length.
Claim 17
Dependent Claim
64 words
A combination as defined in claim 9, further comprising means for subdividing said first beam into said first portion and said second portion, and color selective optical elements located in the path of said second portion and each arranged to reflect a differently colored component of said second portion onto that section of said photosensitive material which is exposed to the modulated second beam.
Claim 18
Dependent Claim
43 words
A combination as defined in claim 15, wherein each of said optical elements is arranged to deflect the respective component of said second portion at a different angle which is a function of the wavelength of the respective component of said second portion.
Claim 19
Dependent Claim
91 words
A combination as defined in claim 16, wherein the angles of incidence of said differently colored components of said second portion satisfy the equations theta r arctan lambda r/ lambda c . tan theta c theta g arctan lambda g/ lambda c . tan theta c theta b arctan lambda b/ lambda c . tan theta c wherein lambda c is the wavelength and theta c is the angle of incidence of the readout beam which is utilized to reconstruct the images of original film from the holograms on black-and-white film.
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) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |