US3633989A
Expired / Lapsed
US
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Method for making reduced bandwidth holograms
Assignee: Polaroid Corp
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Filing: 1969-10-21
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Granted: 1972-01-11
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Expires: 1989-10-21
Abstract
Abstract A method for making a low bandwidth stereoscopic hologram of a subject. Vertical parallax is eliminated to reduce information content. The remainder is transformed to a larger area thereby reducing the information spatial density of the resulting hologram. A narrow horizontal aperture is the means for limiting vertical parallax. The resulting hologram is suitable for television transmission. To view a stereoscopic image of the original subject a real image of the aperture is formed from the resulting hologram. An observer looks through the aperture image as if it were a window to view the stereoscopic subject image.
Inventors
- 👤 Stephen A Benton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:55
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/34; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
111 words
A method for making a hologram of a subject comprising the steps of: illuminating said subject with light from a selected source to create a wave front reflecting therefrom having a given information content related to said subject; limiting the information content of a wave front derived from said reflecting wave front; forming an information-limited real image of said subject from said information-limited derived wave front; combining said information-limited real image with a reference wave front of light having a select phase relationship with said information-limited wave front to form an interference pattern; positioning an image-receiving surface proximate said information-limited real image; and receiving said interference pattern on said image-receiving surface.
Claim 2
Independent Claim
111 words
A method for making a hologram of a subject comprising the steps of: illuminating said subject with light from a selected source to create a wave front reflecting therefrom having a given information content related to said subject; limiting the information content of a wave front derived from said reflecting wave front; forming an information-limited real image of said subject from said information-limited derived wave front; combining said information-limited real image with a reference wave front of light having a select phase relationship with said information-limited wave front to form an interference pattern; positioning an image-receiving surface proximate said information-limited real image; and receiving said interference pattern on said image-receiving surface.
Claim 3
Dependent Claim
29 words
The method for making a hologram of a subject according to claim 1 wherein said step of illuminating said subject is carried out with a source of coherent light.
Claim 4
Dependent Claim
61 words
The method of making a hologram of a subject according to claim 2 wherein said information-limiting step comprises: transferring a select portion of said derived wave front through an aperture having an aspect ratio representing a substantially large dimension in a direction parallel to a given plane of reference and a substantially limited dimension along an axis orthogonal to said plane.
Claim 5
Independent Claim
146 words
A method for making a holographic image, of a subject, having information content and information spatial density limited to a predetermined amount comprising the steps of: illuminating said subject with light from a select source to create a reflected wave front having a given information content and a waveform functionally related to said subject; limiting the information content of a light wave front derived from said reflected wave front; forming from said information-limited wave front an information limited stereOscopic real image of said subject having reduced information spatial density; interferring said light forming said stereoscopic real image having limited information content and reduced information spatial density with a reference light beam having a select waveform and phase relationship with said information-limited wave front to form a holographic image; positioning an image-receiving surface proximate said information-limited real image; and receiving said holographic image on said image-receiving surface.
Claim 6
Independent Claim
146 words
A method for making a holographic image, of a subject, having information content and information spatial density limited to a predetermined amount comprising the steps of: illuminating said subject with light from a select source to create a reflected wave front having a given information content and a waveform functionally related to said subject; limiting the information content of a light wave front derived from said reflected wave front; forming from said information-limited wave front an information limited stereOscopic real image of said subject having reduced information spatial density; interferring said light forming said stereoscopic real image having limited information content and reduced information spatial density with a reference light beam having a select waveform and phase relationship with said information-limited wave front to form a holographic image; positioning an image-receiving surface proximate said information-limited real image; and receiving said holographic image on said image-receiving surface.
Claim 7
Dependent Claim
45 words
The method for making a holographic image of said subject according to claim 4 wherein: limitation of information content is carried out by blocking all but a select portion of said derived wave front, and said stereoscopic real image is formed from said select portion.
Claim 8
Dependent Claim
43 words
The method for making a holographic image according to claim 4 wherein said information-limiting step includes the step of: occluding all but a select portion of said derived wave front by passing said select portion through an aperture having a select aspect ratio.
Claim 9
Dependent Claim
34 words
The method for making a holographic image according to claim 6 further including the step of: forming said aperture so as to transmit a greater amount of horizontal parallactic information than vertical parallactic information.
Claim 10
Dependent Claim
59 words
The method for making a holographic image according to claim 4 wherein said information-limiting step comprises: transferring a select portion of said derived wave front through an aperture having an aspect ratio representing a substantially large dimension in a direction parallel to a given plane of reference and a substantially limited dimension along an axis orthogonal to said plane.
Claim 11
Dependent Claim
27 words
The method for making a holographic image according to claim 4 wherein said step of illuminating said subject is carried out with a source of coherent light.
Claim 12
Independent Claim
176 words
A method for making a holographic image of a subject having a predeterminately limited information content and information spatial density, comprising the steps of: illuminating said subject with coherent light to create a reflected wave front having a given information content and a waveform functionally related to said subject; receiving said reflected wave front on an image-receiving surface; interferring a first coherent reference light having selected waveform and direction with said reflected wave front at said image-receiving surface to form a first holographic image; illuminating said first holographic image with coherent light having the time reverse waveform of said first reference light; limiting the information content of a light wave front diffracted by said holographic image from said time reverse waveform; reconstructing a three-dimensional information limited stereoscopic real image of said subject; receiving said information-limited real image on a second image-receiving surface proximate said information-limited real image; and interferring a second coherent reference light having selected waveform and direction with said information-limited real image at said second image receiving surface to form said information-limited holographic image.
Claim 13
Independent Claim
176 words
A method for making a holographic image of a subject having a predeterminately limited information content and information spatial density, comprising the steps of: illuminating said subject with coherent light to create a reflected wave front having a given information content and a waveform functionally related to said subject; receiving said reflected wave front on an image-receiving surface; interferring a first coherent reference light having selected waveform and direction with said reflected wave front at said image-receiving surface to form a first holographic image; illuminating said first holographic image with coherent light having the time reverse waveform of said first reference light; limiting the information content of a light wave front diffracted by said holographic image from said time reverse waveform; reconstructing a three-dimensional information limited stereoscopic real image of said subject; receiving said information-limited real image on a second image-receiving surface proximate said information-limited real image; and interferring a second coherent reference light having selected waveform and direction with said information-limited real image at said second image receiving surface to form said information-limited holographic image.
Claim 14
Dependent Claim
26 words
The method for making an information-limited holographic image according to claim 10 including the step of recording said first holographic image on said first image-receiving surface.
Claim 15
Dependent Claim
51 words
The method for making an information-limited holographic image according to claim 11 wherein said information-limiting step comprises: occluding all but a select portion of said first holographic image by placing adjacent thereto an aperture having a select aspect ratio representing a substantially large horizontal dimension and a substantially limited vertical dimension.
Claim 16
Dependent Claim
57 words
The method for making an information-limited holographic image according to claim 11 wherein said information-limiting step comprises: limiting the area of said first image-receiving surface to a select aspect ratio representing a substantially Large dimension in a direction parallel to a given plane of reference and a substantially limited dimension along an axis orthogonal to said plane.
Claim 17
Dependent Claim
20 words
The method for making an information-limited hologram according to claim 10 including the step of recording said information-limited holographic image.
Claim 18
Independent Claim
181 words
A method for forming a stereoscopic image of a subject comprising the steps of: illuminating said subject with light from a selected source to create a wave front reflecting therefrom having a given information content related to said subject; limiting the information content of a wave front derived from said reflecting wave front by transferring a select portion of said derived wave front through an aperture having an aspect ratio representing a substantially large horizontal dimension and a substantially limited vertical dimension; forming an information-limited real image of said subject from said information-limited derived wave front, combining said information-limited real image with a reference wave front of light having a select phase relationship with said information-limited wave front to form an interference pattern; positioning an image-receiving surface proximate said information limited real image; receiving said interference pattern on said image-receiving surface; and illuminating said image-receiving surface, having said interference pattern, with the time reverse waveform of said reference wave front to form a real image of said aperture thereby providing a point of observation for said stereoscopic image of said subject.
Claim 19
Independent Claim
181 words
A method for forming a stereoscopic image of a subject comprising the steps of: illuminating said subject with light from a selected source to create a wave front reflecting therefrom having a given information content related to said subject; limiting the information content of a wave front derived from said reflecting wave front by transferring a select portion of said derived wave front through an aperture having an aspect ratio representing a substantially large horizontal dimension and a substantially limited vertical dimension; forming an information-limited real image of said subject from said information-limited derived wave front, combining said information-limited real image with a reference wave front of light having a select phase relationship with said information-limited wave front to form an interference pattern; positioning an image-receiving surface proximate said information limited real image; receiving said interference pattern on said image-receiving surface; and illuminating said image-receiving surface, having said interference pattern, with the time reverse waveform of said reference wave front to form a real image of said aperture thereby providing a point of observation for said stereoscopic image of said subject.
Claim 20
Dependent Claim
27 words
The method for forming a stereoscopic image according to claim 15 wherein the step of illuminating said image-receiving surface includes using a vertical line source of light.
Claim 21
Independent Claim
174 words
A system for transmitting information from which stereoscopic images of a subject can be formed, comprising: means for illuminating said subject with light from a selected source to create a reflected wave front having a given information content and a waveform functionally related to said subject; means for limiting the information content of light wave front derived from said reflected wave front, said means including a narrow horizontal aperture; means, including lens means positioned proximate said aperture, for forming from said information-limited wave front a stereoscopic real image of said subject having limited information content and spatial density; means for interferring said light forming said stereoscopic real image having limited information content and spatial density with a reference light beam having a select waveform and phase relationship with said information-limited wave front to form a holographic image; means for introducing said holographic image to an image-receiving surface proximate said stereoscopic real image; means for scanning said image-receiving surface to form video signals representative of said holographic image; and means for transmitting said video signals.
Claim 22
Independent Claim
174 words
A system for transmitting information from which stereoscopic images of a subject can be formed, comprising: means for illuminating said subject with light from a selected source to create a reflected wave front having a given information content and a waveform functionally related to said subject; means for limiting the information content of light wave front derived from said reflected wave front, said means including a narrow horizontal aperture; means, including lens means positioned proximate said aperture, for forming from said information-limited wave front a stereoscopic real image of said subject having limited information content and spatial density; means for interferring said light forming said stereoscopic real image having limited information content and spatial density with a reference light beam having a select waveform and phase relationship with said information-limited wave front to form a holographic image; means for introducing said holographic image to an image-receiving surface proximate said stereoscopic real image; means for scanning said image-receiving surface to form video signals representative of said holographic image; and means for transmitting said video signals.
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |