US4645291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Holography with insensitivity to object size
Assignee: Newport Corp USA
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Filing: 1984-04-04
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Granted: 1987-02-24
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Expires: 2004-04-04
Abstract
Abstract Holograms of objects are made on a light-responsive medium with the aid of a reference beam and an object beam reflected by the object and, throughout the light-responsive medium, are rendered insensitive to object size by projecting the reflected object beam onto the medium at an angle to said reference beam which is constant throughout the medium within a tolerance imperceptible to that light-responsive medium in terms of spatial frequency of the hologram. Preferably, the reflected object beam is projected onto the light-responsive medium at a constant angle of incidence throughout that medium, and is projected through an aperture having a diameter equal to the angle of the reflected object beam to the reference beam, divided by the product of an angular resolution of the hologram and the above mentioned spatial frequency.
Inventors
- 👤 John T. McCrickerd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:43
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/04; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
82 words
In a method of making a hologram of an object on a light-responsive medium with the aid of a reference beam and an object beam reflected by the object, the improvement comprising the step of: rendering the hologram throughout said light-responsive medium insensitive to object size by projecting said reflected object beam into said medium at an angle to said reference beam constant throughout said medium within a tolerance imperceptible to said light-responsive medium in terms of spatial frequency of the hologram.
Claim 2
Dependent Claim
82 words
In a method of making a hologram of an object on a light-responsive medium with the aid of a reference beam and an object beam reflected by the object, the improvement comprising the step of: rendering the hologram throughout said light-responsive medium insensitive to object size by projecting said reflected object beam into said medium at an angle to said reference beam constant throughout said medium within a tolerance imperceptible to said light-responsive medium in terms of spatial frequency of the hologram.
Claim 3
Dependent Claim
29 words
A method as claimed in claim 1, including the step of: projecting said reflected object beam onto said light-responsive medium at a constant angle of incidence to said medium.
Claim 4
Dependent Claim
23 words
A method as claimed in claim 1, including the step of: projecting said reflected object beam through an aperture to said light-responsive medium.
Claim 5
Dependent Claim
29 words
A method as claimed in claim 3, including the step of: projecting said reflected object beam onto said light-responsive medium at a constant angle of incidence to said medium.
Claim 6
Dependent Claim
66 words
A method as claimed in claim 3, including the steps of: providing said reflected object beam by first generating an object beam and reflecting said generated object beam near said aperture to said object for projection of the thus provided reflected object beam through said aperture to said light-responsive medium; and shielding said aperture against said generated object beam during the reflection thereof near said aperture.
Claim 7
Dependent Claim
59 words
A method as claimed in claim 1, including the steps of: providing an aperture with a diameter equal to said angle of said reflected object beam to said reference beam, divided by a product of an angular resolution required for said object, and said spatial frequency; and projecting said reflected object beam through said aperture to said light-responsive medium.
Claim 8
Dependent Claim
29 words
A method as claimed in claim 6, including the step of: projecting said reflected object beam onto said light-responsive medium at a constant angle of incidence to said medium.
Claim 9
Dependent Claim
39 words
A method as claimed in claim 1, including the step of: projecting said reflected object beam through a lens causing the latter object beam to impinge on said light-responsive medium at a constant angle of incidence to said medium.
Claim 10
Dependent Claim
42 words
A method as claimed in claim 1, including the step of: projecting said reflected object beam through an aperture and a lens causing the latter object beam to impinge on said light-responsive medium at a constant angle of incidence to said medium.
Claim 11
Dependent Claim
78 words
A method as claimed in claim 1, including the steps of: providing an aperture with a diameter equal to said angle of said reflected object beam to said reference beam, divided by a product of an angular resolution required for said object, and said spatial frequency; and projecting said reflected object beam through said aperture and a lens causing the latter object beam to impinge on said light-responsive medium at a constant angle of incidence to said medium.
Claim 12
Dependent Claim
95 words
In apparatus for making a hologram of an object on a light-responsive medium with the aid of a reference beam and an object beam, the improvement comprising in combination: first means for projecting said object beam to said object for reflection thereby; and second means for rendering the hologram throughout said light-responsive medium insensitive to object size, including means for projecting the reflected object beam into said medium at an angle to said reference beam constant throughout said medium within a tolerance imperceptible to said light-responsive medium in terms of spatial frequency of the hologram.
Claim 13
Dependent Claim
95 words
In apparatus for making a hologram of an object on a light-responsive medium with the aid of a reference beam and an object beam, the improvement comprising in combination: first means for projecting said object beam to said object for reflection thereby; and second means for rendering the hologram throughout said light-responsive medium insensitive to object size, including means for projecting the reflected object beam into said medium at an angle to said reference beam constant throughout said medium within a tolerance imperceptible to said light-responsive medium in terms of spatial frequency of the hologram.
Claim 14
Dependent Claim
31 words
Apparatus as claimed in claim 11, wherein: said second means include means for projecting said reflected object beam onto said light-responsive medium at a constant angle of incidence to said medium.
Claim 15
Dependent Claim
28 words
Apparatus as claimed in claim 11, wherein: said second means include an aperture and means for projecting said reflected object beam through said aperture to said light-responsive medium.
Claim 16
Dependent Claim
34 words
Apparatus as claimed in claim 13, wherein: said second means include means for projecting said reflected object beam through said aperture to said light-responsive medium at a constant angle of incidence to said medium.
Claim 17
Dependent Claim
60 words
Apparatus as claimed in claim 11, wherein: said second means include an aperture having a diameter equal to said angle of said reflected object beam to said reference beam, divided by a product of an angular resolution required for said object, and said spatial frequency, and means for projecting said reflected object beam through said aperture to said light-responsive medium.
Claim 18
Dependent Claim
31 words
Apparatus as claimed in claim 15, wherein: said second means include means for projecting said reflected object beam onto said light-responsive medium at a constant angle of incidence to said medium.
Claim 19
Dependent Claim
32 words
Apparatus as claimed in claim 11, wherein: said second means include lens means for projecting the reflected object beam onto said light-responsive medium at a constant angle of incidence to said medium.
Claim 20
Dependent Claim
35 words
Apparatus as claimed in claim 11, wherein: said second means include an aperture and lens combination for projecting the reflected object beam onto said light-responsive medium at a constant angle of incidence to said medium.
Claim 21
Dependent Claim
76 words
Apparatus as claimed in claim 11, wherein: said second means include an aperture having a diameter equal to said angle of said reflected object beam to said reference beam, divided by a product of an angular resolution required for said object, and said spatial frequency, and lens means combined with said aperture for projecting said reflected object beam in conjunction with said aperture onto said light-responsive medium at a constant angle of incidence to said medium.
Claim 22
Dependent Claim
127 words
In apparatus for making a hologram of an object on a light-responsive medium with the aid of a reference beam and an object beam, the improvement comprising in combination: an aperture spaced from said medium; means near said aperture for reflecting said object beam to said object for reflection thereby; means near said aperture for shielding said aperture against the latter object beam during reflection thereof near said aperture; and means for rendering the hologram throughout said light-responsive medium insensitive to object size, including means for projecting the object beam reflected by said object through said aperture into said medium at an angle to said reference beam constant throughout said medium within a tolerance imperceptible to said light-responsive medium in terms of spatial frequency of the hologram.
Claim 23
Dependent Claim
127 words
In apparatus for making a hologram of an object on a light-responsive medium with the aid of a reference beam and an object beam, the improvement comprising in combination: an aperture spaced from said medium; means near said aperture for reflecting said object beam to said object for reflection thereby; means near said aperture for shielding said aperture against the latter object beam during reflection thereof near said aperture; and means for rendering the hologram throughout said light-responsive medium insensitive to object size, including means for projecting the object beam reflected by said object through said aperture into said medium at an angle to said reference beam constant throughout said medium within a tolerance imperceptible to said light-responsive medium in terms of spatial frequency of the hologram.
References Cited (Backward Citations)
US3528719A
Cited
SU765649A1
Cited
USPTO Annuity & Maintenance Windows
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| 3.5 Years (Year 4) | 1990-02-23 | 1990-08-25 | 1991-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-23 | 1994-08-25 | 1995-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-23 | 1998-08-25 | 1999-02-24 | $7700.00 | Window Closed / Lapsed |