US3630592A
Expired / Lapsed
US
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Method and apparatus for determining environment conducive for recording interference patterns and holographically recording
Assignee: Bell and Howell Co
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Filing: 1970-03-30
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Granted: 1971-12-28
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Expires: 1990-03-30
Abstract
Abstract Methods and apparatus for making a hologram of information on a holographic recording medium provide an object path for an object beam of coherent actinic light leading to the recording medium by way of a representative of the information for a modulation of the object beam by the information, and provide a reference path for a reference beam of coherent actinic light leading to the recording medium for an interference of the modulated object beam with the reference beam and a recording of resulting interference patterns on the recording medium. Beams of coherent inert light are provided and transmitted on the object and reference paths, and a control signal indicating an instant at which conditions in the object and reference paths permit to an establishment and recording of the mentioned interference patterns are provided in response to the transmitted beams of inert light. The requisite object and reference beams are transmitted along the object and reference paths, respectively, in response to the signal indicating the latter instant for an establishment and recording of the interference patterns.
Inventors
- 👤 Dexter P Cooper Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:11
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/04; G03H1/0486; G03H2001/0489; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
50 words
A method as claimed in claim 1, wherein: said first and said second beams of coherent actinic light are provided by generating and by splitting a beam of coherent actinic light; and said beams of coherent inert light are provided by generating and splitting a beam of coherent inert light.
Claim 2
Dependent Claim
76 words
A method as claimed in claim 1, wherein: said transmission of beams of coherent inert light includes the steps of transmitting a first beam of coherent inert light on said first path, and transmitting a second beam of coherent inert light on said second path; and said signal is provided in response to said first beam of inert light transmitted on said first path, and said second beam of inert light transmitted on said second path.
Claim 3
Dependent Claim
41 words
A method as claimed in claim 3, wherein: said signal is provided in response to a comparison of said first beam of inert light, transmitted on said first path with said second beam of inert light transmitted on said second path.
Claim 4
Dependent Claim
104 words
A method as claimed in claim 1, wherein: said transmission of beams of coherent inert light includes the steps of transmitting a first beam of coherent inert light on said first path in a first direction and subsequently in a second direction opposite said first direction, and transmitting a second beam of coherent inert light on said second path in a third direction and subsequently in a fourth direction opposite said third direction; and said signal is provided in response to said first beam of inert light transmitted in said second direction, and said second beam of inert light transmitted in said fourth direction.
Claim 5
Dependent Claim
41 words
A method as claimed in claim 5, wherein: said signal is provided in response to a comparison of said first beam of inert light transmitted in said second direction and said second beam of inert light transmitted in said fourth direction.
Claim 6
Dependent Claim
39 words
A method as claimed in claim 5, wherein: said first beam of inert light is transmitted in said second direction by a reflection on said recording medium of said first beam of inert light transmitted in said first direction.
Claim 7
Dependent Claim
39 words
A method as claimed in claim 5, wherein: said second beam of inert light is transmitted in said fourth direction by a reflection on said recording medium of said second beam of inert light transmitted in said third direction.
Claim 8
Dependent Claim
91 words
A method as claimed in claim 1, wherein: said transmission of said beam of coherent inert light includes the steps of transmitting a first beam of coherent inert light on said first path, reflecting said first beam of inert light onto itself at said representation of said information, transmitting a second beam of coherent inert light on said second path, and reflecting said second beam of inert light onto itself at said recording medium; and said signal is provided in response to said reflected first and second beams of inert light.
Claim 9
Dependent Claim
89 words
A method as claimed in claim 1, wherein: said transmission of said beam of coherent inert light includes the steps of transmitting a first beam of coherent inert light on said first path, reflecting said first beam of inert light onto itself at said recording medium, transmitting a second beam of coherent inert light on said second path, and reflecting said second beam of inert light onto itself at said recording medium; and said signal is provided in response to said reflected first and second beams of inert light.
Claim 10
Dependent Claim
124 words
A method as claimed in claim 1, wherein: said transmission of said beams of coherent inert light includes the steps of transmitting a first beam of coherent inert light on said first path, reflecting a first part of said first beam of inert light onto itself at said representation of said information, reflecting a second part of said first beam of inert light onto itself at said recording medium, transmitting a second beam of coherent inert light on said second path, and reflecting said second beam of inert light onto itself at said recording medium; and said signal is provided in response to said reflected first and second parts of said first beam of inert light and said reflected second beam of inert light.
Claim 11
Independent Claim
201 words
A method for making a hologram of information on a holographic recording medium, comprising in combination the steps of: providing a first path for a first beam of coherent actinic light, said first path leading to said recording medium by way of a representation of said information for a modulation of said first beam by said information; providing a second path for a second beam of coherent actinic light, said second path leading to said recording medium for an interference of said modulated first beam with said second beam and a recording of resulting interference patterns on said recording medium; providing a bEam of coherent inert light; reflecting a first part of said beam of coherent inert light at said recording medium; reflecting a second part of said beam of coherent inert light at said representation of said information; providing in response to said reflected first and second parts of said beam of inert light a control signal indicating a condition permitting an establishment and recording of said interference patterns; and transmitting in response to said signal said first and second beams of actinic light along said first and second paths, respectively, for an establishment and recording of said interference patterns.
Claim 12
Dependent Claim
58 words
A method as claimed in claim 12, including the step of: deriving from said beam of coherent inert light a third part; and employing said third part as a reference relative to said reflected first and second inert beam parts in the provision of said signal indicating a condition permitting an establishment and recording of said interference patterns.
Claim 13
Independent Claim
197 words
A method for making a hologram of information on a holographic recording medium, comprising in combination the steps of: providing a first path for a first beam of coherent actinic light, said first path leading to said recording medium by way of a representation of said information for modulation of said first beam by said information; providing a second path for a second beam of coherent actinic light, said second path leading to said recording medium for an interference of said modulated first beam with said second beam and a recording of resulting interference patterns on said recording medium; providing a beam of coherent inert light; transmitting a first part of said beam of coherent inert light on said first path; providing in response to said transmitted first part and in response to a second part of said beam of coherent inert light a control signal indicating an instant at which conditions in said first path permit to an establishment and recording of said interference patterns; and transmitting in response to said signal said first and second beams of actinic light along said first and second paths, respectively, for an establishment and recording of said interference patterns.
Claim 14
Dependent Claim
229 words
Apparatus for making on a holographic recording medium a hologram of information contained in an object, comprising in combination: first means for emitting a pulselike beam of coherent actinic light in response to a control signal; second means operatively associated with said first means for splitting said beam of coherent actinic light into an object beam and a reference beam, and for directing said object beam along an object path leading to said recording medium by way of said object for a modulation of said object beam by said information, and for directing said reference beam along a reference path leading to said recording medium for an interference of said modulated object beam with said reference beam and a recording of resulting interference patterns on said recording medium; third means operatively associated with second means for providing and transmitting beams of coherent inert light on said object and reference paths; fourth means operatively associated with said second means for receiving said transmitted beams of inert light and for deriving from said received beams of inert light an indication of the instant at which conditions in said object and reference paths permit to an establishment and recording of said interference patterns; and fifth means connected between said first and fourth means for providing said control signal for said first means in response to said indication derived by said fourth means.
Claim 15
Dependent Claim
77 words
Apparatus as claimed in claim 15, wherein: said third means include means for providing and transmitting a first beam of coherent inert light on said object path, and providing and transmitting a second beam of coherent inert light on said reference path; and said fourth means iNclude means for receiving said transmitted first and second beams of inert light and for deriving from said received first and second beams of inert light an indication of said instant.
Claim 16
Dependent Claim
45 words
Apparatus as claimed in claim 16, wherein: said fourth means include means for providing said indication in response to a comparison of said first beam of inert light transmitted on said object path with said second beam of inert light transmitted on said reference path.
Claim 17
Dependent Claim
119 words
Apparatus as claimed in claim 15, wherein: said third means include means for providing and transmitting a first beam of coherent inert light on said object path in a first direction and subsequently in a second direction opposite said first direction, and providing and transmitting a second beam of coherent inert light on said reference path in a third direction and subsequently in a fourth direction opposite said third direction; and said fourth means include means for receiving said first beam of inert light transmitted in said second direction and said second beam of inert light transmitted in said fourth direction, and for deriving from said received first and second beams of inert light an indication of said instant.
Claim 18
Dependent Claim
37 words
Apparatus as claimed in claim 18, wherein: said fourth means include means for providing said indication in response to a comparison of said received first beam of inert light with said received second beam of inert light.
Claim 19
Dependent Claim
109 words
Apparatus as claimed in claim 15, wherein: said third means include means for providing and transmitting a first beam of coherent inert light on said object path, for reflection of said first beam of inert light onto itself at said object, and for providing and transmitting a second beam of coherent inert light on said reference path, for reflection of said second beam of inert light onto itself at said recording medium; and said fourth means include means for receiving said reflected first and second beams of inert light and for providing said indication of said instant in response to said received first and second beams of inert light.
Claim 20
Dependent Claim
110 words
Apparatus as claimed in claim 15, wherein: said third means include means for providing and transmitting a first beam of coherent inert light on said object path, for reflection of said first beam of inert light onto itself at said recording medium, and for providing and transmitting a second beam of coherent inert light on said reference path, for reflection of said second beam of inert light onto itself at said recording medium; and said fourth means include means for receiving said reflected first and second beams of inert light and for providing said indication of said instant in response to said received first and second beams of inert light.
Claim 21
Dependent Claim
157 words
Apparatus as claimed in claim 15, wherein: said third means include means for providing and transmitting a first beam of coherent inert light on said object path, for reflection of a first part of said first beam of inert light onto itself at said object, and for reflection of a second part of said first beam of inert light onto itself at said recording medium, and for providing and transmitting a second beam of coherent inert light on said reference path, for reflection of said second beam of inert light onto itself at said recording medium; and said fourth means include means for receiving said reflected first and second parts of said first beam of inert light and said reflected second beam of inert light, and for providing said indication of said instant in response to said received first and second parts of said first beam of inert light and said received second beam of inert light.
Claim 22
Dependent Claim
264 words
Apparatus for making on a holographic recording medium a hologram of information contained in an object, comprising in combination: first means for emitting a pulselike beam of coherent actinic light in response to a control signal; second means operatively associated with said first means for splitting said beam of coherEnt actinic light into an object beam and a reference beam, and for directing said object beam along a first path leading to said recording medium by way of said object for a modulation of said object beam by said information, and for directing said reference beam along a second path leading to said recording medium for an interference of said modulated object beam with said reference beam and a recording of resulting interference patterns on said recording medium; third means operatively associated with said second means for providing a beam of coherent inert light, for reflection of a first part of said beam of coherent inert light at said recording medium, and for reflection of a second part of said beam of coherent inert light at said object; fourth means operatively associated with said second means for receiving said reflected first and second parts of said beam of coherent inert light and for deriving from said received first and second parts an indication of the instant at which conditions in said object and reference paths permit to an establishment and recording of said interference patterns; and fifth means connected between said first and fourth means for providing said control signal for said first means in response to said indication derived by said fourth means.
Claim 23
Dependent Claim
95 words
Apparatus as claimed in claim 23, including: sixth means operatively associated with said third means for directing a third part of said beam of coherent inert light to said fourth means; said fourth means being operatively associated with said second and sixth means for receiving said third part in addition to said reflected first and second parts of coherent inert light and for deriving from said received first, second and third parts said indication of an instant at which conditions in said object and reference paths permit an establishment and recording of said interference patterns.
Claim 24
Dependent Claim
251 words
Apparatus for making on a holographic recording medium a hologram of information contained in an object, comprising in combination: first means for emitting a pulselike beam of coherent actinic light in response to a control signal; second means operatively associated with said first means for splitting said beam of coherent actinic light into an object beam and a reference beam, and for directing said object beam along an object path leading to said recording medium by way of said object for a modulation of said object beam by said information, and for directing said reference beam along a reference path leading to said recording medium for an interference of said modulated object beam with said reference beam and a recording of resulting interference patterns on said recording medium; third means for providing a beam of coherent inert light; fourth means operatively associated with said second and third means for transmitting a first part of said beam of coherent inert light on said object path; fifth means operatively associated with said third and fourth means for deriving from said transmitted first part of said beam of coherent inert light and from a second part of said beam of coherent inert light an indication of the instant at which conditions in said object path permit to an establishment and recording of said interference patterns; and fifth means connected between said first and fourth means for providing said control signal for said first means in response to said indication derived by said fourth means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |