Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1977-02-15
1978-08-01
Stern, Ronald J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
350 360, 358128, 358132, 365125, 365216, G03H 130, G11B 700
Patent
active
041044894
ABSTRACT:
The holographic recording system comprises a pair of aligned first and second Fourier transforming lenses, a holographic beam splitter having a series of random phase illumination holograms at a front focal plane of the first lens and arranged to move in a given direction to successively receive a light beam for deffracting it into a zero-order diffracted beam and a first-order diffracted array of sampled, phase shifted beams, and a mask having a first and second apertures disposed at the Fourier transform plane of the first lens. A page composer having electrooptical transducers is positioned in the second aperture to receive the first-order diffracted array of beams to spatially optically modulate the incident beams in accordance with one of successive groups of binary signals. The zero-order diffracted beam is allowed to pass through the first aperture and the first-order diffracted array of spatially modulated beams are focused by the second lens to produce interference fringes between the wavefronts of zero- and first-order beams on a Fourier transform plane of the second lens on which a recording medium is positioned. The holographic beam splitter and the recording medium are conjugate to each other relative to the lens system and moved in opposite directions at equal speeds in synchronism with the occurrence of each group of binary signals, a series of two-dimensional holograms of the binary information is recorded.
REFERENCES:
patent: 3838904 (1974-10-01), Takeda et al.
patent: 3917380 (1975-11-01), Kato et al.
patent: 3977771 (1976-08-01), Horner
patent: 4021606 (1977-05-01), Takeda et al.
patent: 4037918 (1977-07-01), Kato
Kato Makoto
Satoh Isao
Adams Bruce L.
Burns Robert E.
Lobato Emmanuel J.
Matsushita Electric - Industrial Co., Ltd.
Stern Ronald J.
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