US4986619A
Expired / Lapsed
US
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Holographic color control systems
Assignee: Massachusetts Institute of Technology
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Filing: 1989-10-30
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Granted: 1991-01-22
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Expires: 2009-10-30
Abstract
Abstract Holographic color control systems are disclosed for the production of pseudocolor holograms by in-situ sequential swelling of an emulsion and exposure to three color separation images with a single wavelength reference light source. The resulting holograms yield images in three color primaries with excellent color registration and mixing, producing a full gamut of mixed colors, pastels and neutrals with three-dimensional perspective.
Inventors
- 👤 Julie L. Walker
- 👤 Stephen A. Benton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:02
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/22; G03H1/2249; G03H1/04; G03H1/18; G03H1/26; G03H1/0402; G03H2001/0415; G03H2001/0432; G03H2001/186; G03H2001/2263; G03H1/2286; G03H2001/2289
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
76 words
A method of recording a pseudocolor hologram, the method comprising: pretreating a holographic recording medium formed from a polymeric emulsion with an enzymatic agent to reduce crosslinkage of the polymeric emulsion, and thereby reduce swelling anomalies upon exposure to a swelling solution; and exposing the recording medium to a plurality of color separation images while the volume of the emulsion is varied by swelling to form a set of registered holographic images having different reconstruction wavelengths.
Claim 2
Independent Claim
76 words
A method of recording a pseudocolor hologram, the method comprising: pretreating a holographic recording medium formed from a polymeric emulsion with an enzymatic agent to reduce crosslinkage of the polymeric emulsion, and thereby reduce swelling anomalies upon exposure to a swelling solution; and exposing the recording medium to a plurality of color separation images while the volume of the emulsion is varied by swelling to form a set of registered holographic images having different reconstruction wavelengths.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein the step of pretreating the medium further comprises contacting the emulsion with a proteolytic enzyme.
Claim 4
Dependent Claim
33 words
The method of claim 1 wherein the step of pretreating the medium further comprises contacting the emulsion with an enzyme chosen from the group consisting of trypsin, collagenase, maxatase, papain, and mixtures thereof.
Claim 5
Dependent Claim
19 words
The method of claim 1 wherein the step of pretreating the medium further comprises contacting the emulsion with trypsin.
Claim 6
Dependent Claim
35 words
The method of claim 1 wherein the step of pretreating the medium further comprises contacting the emulsion with a solution ranging from about 0.001 percent to about 0.00005 percent by weight of the enzymatic agent.
Claim 7
Independent Claim
169 words
A method of holographic color control, the method comprising: treating a holographic emulsion with an enzymatic agent to induce the cleavage of bonds in the emulsion, and thereby reduce swelling anomalies; contacting said holographic emulsion with a first swelling solution to produce an increase in thickness of said emulsion; exposing said emulsion following contact with said first solution to a first color-separated image to create a recording capable of producing a first reconstruction color image; contacting said holographic emulsion with a second swelling solution to produce a variation in the thickness of said emulsion; exposing said emulsion following contact with said second solution to a second color separated image to create a recording capable of producing a second reconstruction color image; contacting said holographic emulsion with a third swelling solution to produce a further variation in the thickness of said emulsion; and exposing said emulsion following contact with said third solution to a third color separated image to create a recording capable of producing a third reconstruction color image.
Claim 8
Independent Claim
169 words
A method of holographic color control, the method comprising: treating a holographic emulsion with an enzymatic agent to induce the cleavage of bonds in the emulsion, and thereby reduce swelling anomalies; contacting said holographic emulsion with a first swelling solution to produce an increase in thickness of said emulsion; exposing said emulsion following contact with said first solution to a first color-separated image to create a recording capable of producing a first reconstruction color image; contacting said holographic emulsion with a second swelling solution to produce a variation in the thickness of said emulsion; exposing said emulsion following contact with said second solution to a second color separated image to create a recording capable of producing a second reconstruction color image; contacting said holographic emulsion with a third swelling solution to produce a further variation in the thickness of said emulsion; and exposing said emulsion following contact with said third solution to a third color separated image to create a recording capable of producing a third reconstruction color image.
Claim 9
Dependent Claim
43 words
The method of claim 6 wherein the step of exposing said emulsion to said first, second and third color-separated images further comprises exposing the emulsion to said color-separated images in-situ while the emulsion remains bathed by said first, second and third solutions, respectively.
Claim 10
Dependent Claim
23 words
The method of claim 6 wherein the step of treating the emulsion with an enzymatic agent further comprises treating said emulsion with trypsin.
Claim 11
Dependent Claim
19 words
The method of claim 6 wherein said swelling solutions are a combination of water and a water miscible solvent.
Claim 12
Dependent Claim
26 words
The method of claim 9 wherein said solvent is a solvent chosen from the group consisting of methanol, ethanol, propanols, butanols, pentanols, acetone, and mixtures thereof.
Claim 13
Dependent Claim
12 words
The method of claim 9 wherein said water miscible solvent is 2-propanol.
Claim 14
Dependent Claim
56 words
In a method of recording pseudocolor holograms by exposing a polymeric emulsion to a plurality of color separation images while the volume of the emulsion is varied by swelling to form a set of superimposed holographic images having different reconstruction wavelengths, the improvement comprising: pretreating the polymeric emulsion with an enzymatic agent to reduce swelling anomalies.
Claim 15
Dependent Claim
56 words
In a method of recording pseudocolor holograms by exposing a polymeric emulsion to a plurality of color separation images while the volume of the emulsion is varied by swelling to form a set of superimposed holographic images having different reconstruction wavelengths, the improvement comprising: pretreating the polymeric emulsion with an enzymatic agent to reduce swelling anomalies.
Claim 16
Dependent Claim
22 words
The method of claim 12 wherein the step of pretreating the polymeric emulsion further comprises treating the emulsion with a proteolytic agent.
Claim 17
Dependent Claim
20 words
The method of claim 12 wherein the step of pretreating the polymeric emulsion further comprises treating the emulsion with trypsin.
Claim 18
Dependent Claim
129 words
A holographic printer for recording pseudocolor holograms comprising: a holographic recording medium formed from a polymeric emulsion; a laser source of coherent light; a beamsplitter for splitting said laser light into an object beam and a reference beam; object beam projection means for projecting a plurality of color-separated images of an object onto said recording medium; reference beam projection means for projecting a reference beam onto said medium coincident with the projection of each color-separated image so as to create overlapping exposures with said object images; treatment means for treating said emulsion with an enzymatic agent to reduce swelling anomalies; and swelling means for varying the volume of the emulsion between exposures with said color-separated object images to form a set of superimposed holographic images having different reconstruction wavelengths.
Claim 19
Dependent Claim
129 words
A holographic printer for recording pseudocolor holograms comprising: a holographic recording medium formed from a polymeric emulsion; a laser source of coherent light; a beamsplitter for splitting said laser light into an object beam and a reference beam; object beam projection means for projecting a plurality of color-separated images of an object onto said recording medium; reference beam projection means for projecting a reference beam onto said medium coincident with the projection of each color-separated image so as to create overlapping exposures with said object images; treatment means for treating said emulsion with an enzymatic agent to reduce swelling anomalies; and swelling means for varying the volume of the emulsion between exposures with said color-separated object images to form a set of superimposed holographic images having different reconstruction wavelengths.
Claim 20
Dependent Claim
38 words
The printer of claim 15 wherein the swelling means further comprises a transparent housing for holding said emulsion, and a swelling solution reservoir for bathing the emulsion in a swelling solution to induce variations in the emulsion thickness.
Claim 21
Dependent Claim
27 words
The printer of claim 16 wherein the housing further comprises a filling inlet and a drainage outlet to permit contact of the emulsion with different swelling solutions.
References Cited (Backward Citations)
US4498740A
Cited
US4834476A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-01-21 | 1994-07-23 | 1995-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-21 | 1998-07-23 | 1999-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-21 | 2002-07-23 | 2003-01-22 | $7700.00 | Window Closed / Lapsed |