US3572880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Eliminating a perturbation when forming a holagraphic spatial filter
Assignee: NCR Voyix Corp
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Filing: 1968-12-31
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Granted: 1971-03-30
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Expires: 1988-12-31
Abstract
Abstract The present invention relates to a method of eliminating perturbation between a reference beam and a source beam during the formation of a hologram. A Fraunhofer diffraction pattern of the subject of the hologram is placed in front of a recording medium in which a hologram of the subject is to be formed. Perturbation between the reference beam and the source beam is thus eliminated. A hologram, such as is used in a character recognition system, may be improved by the method of the present invention.
Inventors
- 👤 Thomas J Negrelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:10
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/04; G03H1/16; G06; G06V; G06V10/00; G06V10/88; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
247 words
A method of forming a hologram on a first recording medium, of recorded information in the form of a transparent configuration recorded on a second recording medium, comprising: positioning said second recording medium between a source of homogeneous monochromatic light and a Fourier transformation lens at the front focal plane of said Fourier transformation lens; allowing light from said source of homogeneous monochromatic light to pass through said transparent configuration recorded on said second recording medium and onto a third recording medium in the rear focal plane of said Fourier transformation lens to form a Fraunhofer diffraction pattern of said transparent configuration thereon; developing said third recording medium; positioning a focusing lens between said source of homogeneous monochromatic light and said second recording medium; said focusing lens being operable to focus a portion of light from said source of homogeneous monochromatic light into a spot of light in the plane of said second recording medium; allowing a portion of light from said source of homogeneous monochromatiC light to pass successively through said transparent configuration recorded on said second recording medium, said Fourier transformation lens, and the developed third recording medium, onto said first recording medium, the first and third recording media being located in the rear focal plane of said Fourier transformation lens; and allowing another portion of light from said source of homogeneous monochromatic light to pass successively through said focusing lens, said Fourier transformation lens, the developed third recording medium onto said first recording medium.
Claim 2
Independent Claim
247 words
A method of forming a hologram on a first recording medium, of recorded information in the form of a transparent configuration recorded on a second recording medium, comprising: positioning said second recording medium between a source of homogeneous monochromatic light and a Fourier transformation lens at the front focal plane of said Fourier transformation lens; allowing light from said source of homogeneous monochromatic light to pass through said transparent configuration recorded on said second recording medium and onto a third recording medium in the rear focal plane of said Fourier transformation lens to form a Fraunhofer diffraction pattern of said transparent configuration thereon; developing said third recording medium; positioning a focusing lens between said source of homogeneous monochromatic light and said second recording medium; said focusing lens being operable to focus a portion of light from said source of homogeneous monochromatic light into a spot of light in the plane of said second recording medium; allowing a portion of light from said source of homogeneous monochromatiC light to pass successively through said transparent configuration recorded on said second recording medium, said Fourier transformation lens, and the developed third recording medium, onto said first recording medium, the first and third recording media being located in the rear focal plane of said Fourier transformation lens; and allowing another portion of light from said source of homogeneous monochromatic light to pass successively through said focusing lens, said Fourier transformation lens, the developed third recording medium onto said first recording medium.
Claim 3
Independent Claim
223 words
A method of forming a hologram, on a first recording medium, of recorded information in the form of a transparent configuration recorded on a second recording medium, comprising: positioning a third recording medium, comprising a Fraunhofer diffraction pattern of said transparent configuration recorded on said second recording medium, between a Fourier transformation lens and said first recording medium, the first and third recording media being located in the rear focal plane of said Fourier transformation lens; positioning said second recording medium between a source of homogeneous monochromatic light and said Fourier transformation lens at the front focal plane of said Fourier transformation lens; positioning a focusing lens between said source of homogeneous monochromatic light and said second recording medium; said focusing lens being operable to focus a portion of light from said source of homogeneous monochromatic light into a spot of light in the plane of said second recording medium; allowing a portion of light from said source of homogeneous monochromatic light to pass successively through said transparent configuration recorded on said second recording medium, said Fourier transformation lens, and said third recording medium onto said first recording medium; and allowing another portion of light from said source of homogeneous monochromatic light to pass successively through said focusing lens, said Fourier transformation lens, and said third recording medium onto said first recording medium.
Claim 4
Independent Claim
223 words
A method of forming a hologram, on a first recording medium, of recorded information in the form of a transparent configuration recorded on a second recording medium, comprising: positioning a third recording medium, comprising a Fraunhofer diffraction pattern of said transparent configuration recorded on said second recording medium, between a Fourier transformation lens and said first recording medium, the first and third recording media being located in the rear focal plane of said Fourier transformation lens; positioning said second recording medium between a source of homogeneous monochromatic light and said Fourier transformation lens at the front focal plane of said Fourier transformation lens; positioning a focusing lens between said source of homogeneous monochromatic light and said second recording medium; said focusing lens being operable to focus a portion of light from said source of homogeneous monochromatic light into a spot of light in the plane of said second recording medium; allowing a portion of light from said source of homogeneous monochromatic light to pass successively through said transparent configuration recorded on said second recording medium, said Fourier transformation lens, and said third recording medium onto said first recording medium; and allowing another portion of light from said source of homogeneous monochromatic light to pass successively through said focusing lens, said Fourier transformation lens, and said third recording medium onto said first recording medium.
Claim 5
Independent Claim
340 words
A method of determining the presence and position of selected information, in the form of a transparent configuration recorded on a first recording medium, with respect to other similar information recorded thereon, comprising: positioning a second recording medium, containing said selected information, between a source of homogeneous monochromatic light and a Fourier transformation lens at the front focal plane of said Fourier transformation lens; allowing light from said source of homogeneous monochromatic light to pass through said transparent configuration corresponding to said selected information recorded on said second recording medium and onto a third recording medium in the rear focal plane of said Fourier transformation lens to form a Fraunhofer diffraction pattern of said transparent configuration thereon; developing said third recording medium; positioning a focusing lens between said source of homogeneous monochromatic light and said second recording medium; said focusing lens being operable to focus a portion of light from said source of homogeneous monochromatic light into a spot of light in the plane of said second recording medium; allowing a portion of light from said source of homogeneous monochromatic light to pass successively through said transparent configuration recorded on said second recording medium, said Fourier transformation lens, and the developed third recording medium onto a fourth recording medium, the fourth and third recording media being located in the rear focal plane of said Fourier transformation lens; allowing another portion of light from said source of homogeneous monochromatic light to pass successively through said focusing lens, said Fourier transformation lens, and the developed third recording medium onto said fourth recording medium, said fourth recording medium thereby being a hologram; positioning said first recording medium, so as to replace said second recording medium, between said source of homogeneous monochromatic light and said Fourier transformation lens; and allowing light from said source of homogeneous monochromatic light to pass successively through said first recording medium, said Fourier transformation lens, said fourth recording medium, and an imaging lens onto a light detector means whereby the presence and position of said selected information are determined.
Claim 6
Independent Claim
340 words
A method of determining the presence and position of selected information, in the form of a transparent configuration recorded on a first recording medium, with respect to other similar information recorded thereon, comprising: positioning a second recording medium, containing said selected information, between a source of homogeneous monochromatic light and a Fourier transformation lens at the front focal plane of said Fourier transformation lens; allowing light from said source of homogeneous monochromatic light to pass through said transparent configuration corresponding to said selected information recorded on said second recording medium and onto a third recording medium in the rear focal plane of said Fourier transformation lens to form a Fraunhofer diffraction pattern of said transparent configuration thereon; developing said third recording medium; positioning a focusing lens between said source of homogeneous monochromatic light and said second recording medium; said focusing lens being operable to focus a portion of light from said source of homogeneous monochromatic light into a spot of light in the plane of said second recording medium; allowing a portion of light from said source of homogeneous monochromatic light to pass successively through said transparent configuration recorded on said second recording medium, said Fourier transformation lens, and the developed third recording medium onto a fourth recording medium, the fourth and third recording media being located in the rear focal plane of said Fourier transformation lens; allowing another portion of light from said source of homogeneous monochromatic light to pass successively through said focusing lens, said Fourier transformation lens, and the developed third recording medium onto said fourth recording medium, said fourth recording medium thereby being a hologram; positioning said first recording medium, so as to replace said second recording medium, between said source of homogeneous monochromatic light and said Fourier transformation lens; and allowing light from said source of homogeneous monochromatic light to pass successively through said first recording medium, said Fourier transformation lens, said fourth recording medium, and an imaging lens onto a light detector means whereby the presence and position of said selected information are determined.
Claim 7
Independent Claim
310 words
A method of determining the presence and position of selected information, in the form of a transparent configuration recorded on a first recording medium, with respect to other similar information recorded thereon, comprising: positioning a second recording medium, containing said selected information, between a source of homogeneous monochromatic light and a Fourier transformation lens at the front focal plane of said Fourier transformation lens; positioning a focusing lens between said source of homogeneous monochromatic light and said second recording medium, said focusing lens being operable to focus a portion of light from said source of homogeneous monochromatic light into a spot of light in the plane of said second recording medium; positioning a third recording medium, comprising a Fraunhofer diffraction pattern corresponding to said selected information recorded on said second recording medium, between said Fourier transformation lens and a fourth recording medium, the fourth and third recording media being located in the rear focal plane of said Fourier transformation lens; allowing a portion of light from said source of homogeneous monochromatic light to pass successively through said transparent configuration recorded on said second recording medium, said Fourier transformation lens, and said third recording medium onto a fourth recording medium; allowing another portion of light from said source of homogeneous monochromatic light to pass successively through said focusing lens, said Fourier transformation lens, and said third recording, onto said fourth recording medium, said fourth recording medium thereby being a hologram; positioning said first recording medium so as to replace said second recording medium, between said source of homogeneous monochromatic light and said Fourier transformation lens; and allowing light from said source of homogeneous monochromatic light to pass successively through said first recording medium, said Fourier transformation lens, said fourth recording medium, and an imaging lens onto a light detector means whereby the presence and position of said selected information are determined.
Claim 8
Independent Claim
310 words
A method of determining the presence and position of selected information, in the form of a transparent configuration recorded on a first recording medium, with respect to other similar information recorded thereon, comprising: positioning a second recording medium, containing said selected information, between a source of homogeneous monochromatic light and a Fourier transformation lens at the front focal plane of said Fourier transformation lens; positioning a focusing lens between said source of homogeneous monochromatic light and said second recording medium, said focusing lens being operable to focus a portion of light from said source of homogeneous monochromatic light into a spot of light in the plane of said second recording medium; positioning a third recording medium, comprising a Fraunhofer diffraction pattern corresponding to said selected information recorded on said second recording medium, between said Fourier transformation lens and a fourth recording medium, the fourth and third recording media being located in the rear focal plane of said Fourier transformation lens; allowing a portion of light from said source of homogeneous monochromatic light to pass successively through said transparent configuration recorded on said second recording medium, said Fourier transformation lens, and said third recording medium onto a fourth recording medium; allowing another portion of light from said source of homogeneous monochromatic light to pass successively through said focusing lens, said Fourier transformation lens, and said third recording, onto said fourth recording medium, said fourth recording medium thereby being a hologram; positioning said first recording medium so as to replace said second recording medium, between said source of homogeneous monochromatic light and said Fourier transformation lens; and allowing light from said source of homogeneous monochromatic light to pass successively through said first recording medium, said Fourier transformation lens, said fourth recording medium, and an imaging lens onto a light detector means whereby the presence and position of said selected information are determined.
References Cited (Backward Citations)
US3414875A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |