Patent US4995685A successfully refreshed from Google Patents.
US4995685A
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Method and system for making a reflection hologram
Assignee: EIDP Inc
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Filing: 1989-05-16
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Granted: 1991-02-26
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Expires: 2009-05-16
Abstract
Abstract The invention relates to a method and system for making reflection holograms and, more specifically, for making reflection holograms from a cylindrical surface of a master. Means are provided to direct substantially monochromatic actinic radiation through a recording medium sensitive to such radiation coupled to the cylindrical surface of the master such that the angle of incidence of the radiation on the master is substantially constant.
Inventors
- 👤 Mark L. Armstrong
- 👤 Daniel J. Mickish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:07
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/04; G03H1/20; G03H1/202; G03H1/02; G03H1/024; G03H1/0244; G03H1/0248; G03H1/0402; G03H2001/0415; G03H2001/043; G03H1/0465; G03H2001/0473; G03H2001/207; G03H1/22; G03H1/2202; G03H2001/2223; G03H2001/2231; G03H2222/00; G03H2222/36; G03H2222/50; G03H2222/54; G03H2222/55; G03H2223/00; G03H2223/25; G03H2270/00; G03H2270/20; G03H2270/21; G03H2270/23
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
119 words
A system for making a reflection hologram comprising: an at least partially reflective or diffractive master having a cylindrical surface symmetric about an axis; a holographic recording medium coupled to the master cylindrical surface; and means for directing a reference beam of substantially coherent radiation through the recording medium to the master cylindrical surface, the directing means including means for focusing the radiation so that the angle of incidence of the radiation on the master is substantially constant, such that when the directing means directs the reference beam through the recording medium, an object beam reflects off the master and passes back through the recording medium interfering with the reference beams forming a reflection hologram in the recording medium.
Claim 2
Independent Claim
119 words
A system for making a reflection hologram comprising: an at least partially reflective or diffractive master having a cylindrical surface symmetric about an axis; a holographic recording medium coupled to the master cylindrical surface; and means for directing a reference beam of substantially coherent radiation through the recording medium to the master cylindrical surface, the directing means including means for focusing the radiation so that the angle of incidence of the radiation on the master is substantially constant, such that when the directing means directs the reference beam through the recording medium, an object beam reflects off the master and passes back through the recording medium interfering with the reference beams forming a reflection hologram in the recording medium.
Claim 3
Dependent Claim
16 words
The system of claim 1, wherein the master comprises a polyester film with a metalized coating.
Claim 4
Dependent Claim
21 words
The system of claim 2, wherein the recording medium comprises a photohardenable film coated on, or laminated to, the metalized coating.
Claim 5
Dependent Claim
22 words
The system of claim 1, wherein the recording medium comprises a silver halide emulsion or a film made of a photohardenable composition.
Claim 6
Dependent Claim
17 words
The system of claim 1, further comprising: means for rotating the master cylindrical surface about the axis.
Claim 7
Dependent Claim
61 words
The system of claim 5, further comprising: means for storing an unexposed portion of the recording medium; and means for receiving an exposed portion of the recording medium, whereby the rotating means transports unexposed recording medium from the storing means to the cylindrical surface for exposure by the directing means and then transports the exposed recording medium to the receiving means.
Claim 8
Dependent Claim
28 words
The system of claim 5, wherein the rotating means is for continuously rotating the master cylindrical surface while the recording medium is being exposed by the directing means.
Claim 9
Dependent Claim
38 words
The system of claim 5, wherein the rotating means is for rotating the master cylindrical surface to position the recording medium for exposure and the master cylindrical surface is not rotating while the recording medium is being exposed.
Claim 10
Dependent Claim
17 words
The system of claim 1, further comprising: means for optically coupling the recording medium to the master.
Claim 11
Dependent Claim
67 words
The system of claim 9, wherein the coupling means comprises: means for applying a liquid with a refractive index matched to optically couple the recording medium and the master prior to exposure; and means for removing excess liquid from between the master and the recording medium prior to exposure and for removing liquid from a surface of the recording medium farthest from the master prior to exposure.
Claim 12
Dependent Claim
33 words
The system of claim 1, wherein the focusing means is for focusing the radiation substantially to a line which is substantially parallel to or coincident with the axis of the master cylindrical surface.
Claim 13
Dependent Claim
49 words
The system of claim 1, wherein the focusing means is for focusing the radiation substantially to a line parallel to or coincident with the axis of the master cylindrical surface and substantially in a plane that is perpendicular to an optical axis of the means for focusing the beam.
Claim 14
Dependent Claim
58 words
The system of claim 1, wherein the focusing means is for focusing the radiation substantially to a line parallel to or coincident with the axis of the master cylindrical surface and substantially in a plane that is perpendicular to an optical axis of the means for focusing the beam and contains the axis of the master cylindrical surface.
Claim 15
Dependent Claim
60 words
The system of claim 1, wherein the focusing means comprises: means for expanding a beam of the radiation in one dimension forming a diverging fan beam; and means for receiving the diverging fan beam from the expanding means and collimating the diverging fan beam forming a collimated curtain beam for directing through the recording medium to the master cylindrical surface.
Claim 16
Dependent Claim
45 words
The system of claim 1, wherein the focusing means is for focusing the radiation such that the difference between the maximum angle of incidence and the minimum angle of incidence of the radiation on the master is less than or equal to about five degrees.
Claim 17
Dependent Claim
67 words
The system of claim 1, wherein the directing means further comprises: a laser for emitting the radiation comprising at least substantially collimated, coherent, monochromatic and polarized light; a variable polarizer for selecting a preferred polarization for the light; a first spherical lens for expanding the light; and a second spherical lens for collimating the expanded light and for directing the collimated, expanded light to the focusing means.
Claim 18
Dependent Claim
26 words
The system of claim 16, wherein the directing means further comprises: means for steering the light; and a spatial filter for reducing nonuniformities in the light.
Claim 19
Independent Claim
90 words
A method of making a reflection hologram comprising the steps of: coupling a holographic recording medium to a cylindrical surface of an at least partially reflective or diffractive master; and directing a reference beam of substantially coherent radiation through the holographic recording medium to the cylindrical surface of the master so that the angles of incidence of the radiation on the master are substantially constant to expose the recording medium by the reference beam and by an object beam which is the reference beam reflected or diffracted from the master.
Claim 20
Independent Claim
90 words
A method of making a reflection hologram comprising the steps of: coupling a holographic recording medium to a cylindrical surface of an at least partially reflective or diffractive master; and directing a reference beam of substantially coherent radiation through the holographic recording medium to the cylindrical surface of the master so that the angles of incidence of the radiation on the master are substantially constant to expose the recording medium by the reference beam and by an object beam which is the reference beam reflected or diffracted from the master.
Claim 21
Dependent Claim
25 words
The method of claim 18, further comprising the step of: rotating the holographic recording medium coupled to the cylindrical surface of master about an axis.
Claim 22
Dependent Claim
13 words
The method of claim 19, wherein the directing and rotating steps occur simultaneously.
Claim 23
Dependent Claim
13 words
The method of claim 19, wherein the directing and rotating steps occur alternately.
Claim 24
Dependent Claim
33 words
The method of claim 18, further comprising the step of: focusing the reference beam substantially to a line which is substantially parallel to or coincident with an axis of the master cylindrical surface.
Claim 25
Dependent Claim
50 words
The method of claim 18, further comprising the step of: focusing the reference beam substantially to a line which is substantially parallel to or coincident with an axis of the master cylindrical surface and substantially in a plane that is perpendicular to an optical axis of means focusing the beam.
Claim 26
Dependent Claim
59 words
The method of claim 18, further comprising the step of: focusing the reference beam substantially to a line which is substantially parallel to or coincident with an axis of the master cylindrical surface and substantially in a plane that is perpendicular to an optical axis of means focusing the beam and contains the axis of the master cylindrical surface.
Claim 27
Dependent Claim
41 words
The method of claim 18, further comprising the step of: expanding a beam of the radiation in one dimension forming a diverging fan beam; and collimating the diverging fan beam forming a collimated curtain beam for use as the reference beam.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-25 | 1994-08-27 | 1995-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-25 | 1998-08-27 | 1999-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-25 | 2002-08-27 | 2003-02-26 | $7700.00 | Window Closed / Lapsed |