US3930119A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Facsimile apparatus for writing and reading mechanically moving documents
Assignee: US Philips Corp
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Filing: 1974-09-20
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Granted: 1975-12-30
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Expires: 1994-09-20
Abstract
Abstract The invention relates to a facsimile apparatus using positionally controllable light beams for writing and reading information on mechanically moving documents. The apparatus comprises an electronically controllable switching mask plate which is made of a material containing mixed crystals of lead zirconate and lead titanate, doped with lanthanum is disposed between polarisation filters, and is provided with a row of electrodes to which voltages may selectively be applied. The light which is controlled by the mask plate scans the document.
Inventors
- 👤 Rolf Schmidt
- 👤 Klaus Carl
- 👤 Pol Ambroise Ghislain J Gustin
- 👤 Raymond Georges Schayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:29
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/024; G; G02; G02F; G02F1/00; G02F1/01; G02F1/03; G02F1/055; G02F1/0556
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
94 words
FACSIMILE APPARATUS USING POSITIONALLY CONTROLLABLE LIGHT BEAMS FOR WRITING AND READING INFORMATION ON MECHANICALLY MOVING DOCUMENTS, SAID APPARATUS COMPRISING A PAIR OF POLARIZATION FILTERS, AN ELECTRONICALLY CONTROLABLE SWITCHING MASK PLATE HAVING TWO MAJOR FACES AND CONSISTING OF MIXED CRYSTALS OF LEAD ZIRCONATE AND LEAD TITANATE DOPED WITH LANTHAUNM, SAID PLATE BEING DISPOSED BETWEEN SAID POLARISATION FILTERS, A PLURALITY OF ALIGNED ELECTRODES DISPOSED IN ROWS ON SAID PLATE AND MEANS FOR SELECTIVELY APPLYING VOLTAGE TO SAID ELECTRODES, WHEREBY THE LIGHT WHICH IS CONTROLLED BY THE MASK PLATE SCANS THE DOCUMENT TO BE READ OR WRITTEN.
Claim 2
Dependent Claim
94 words
FACSIMILE APPARATUS USING POSITIONALLY CONTROLLABLE LIGHT BEAMS FOR WRITING AND READING INFORMATION ON MECHANICALLY MOVING DOCUMENTS, SAID APPARATUS COMPRISING A PAIR OF POLARIZATION FILTERS, AN ELECTRONICALLY CONTROLABLE SWITCHING MASK PLATE HAVING TWO MAJOR FACES AND CONSISTING OF MIXED CRYSTALS OF LEAD ZIRCONATE AND LEAD TITANATE DOPED WITH LANTHAUNM, SAID PLATE BEING DISPOSED BETWEEN SAID POLARISATION FILTERS, A PLURALITY OF ALIGNED ELECTRODES DISPOSED IN ROWS ON SAID PLATE AND MEANS FOR SELECTIVELY APPLYING VOLTAGE TO SAID ELECTRODES, WHEREBY THE LIGHT WHICH IS CONTROLLED BY THE MASK PLATE SCANS THE DOCUMENT TO BE READ OR WRITTEN.
Claim 3
Dependent Claim
33 words
Facsimile apparatus as claimed in claim 1, wherein said electrodes are oppositely disposed on the two major faces of the switching mask plate, the light being incident through the opposed rows of electrodes.
Claim 4
Dependent Claim
35 words
Facsimile apparatus as claimed in claim 1, wherein said rows of electrodes are disposed side by side on one major face of the switching mask plate, the light being incident between the rows of electrodes.
Claim 5
Dependent Claim
16 words
Facsimile apparatus as claimed in claim 1, wherein one row of electrodes comprises a continuous electrode.
Claim 6
Dependent Claim
26 words
Facsimile apparatus as claimed in claim 1, comprising a plurality of switching mask plates arranged in a stack, to form a raster of controllable light beams.
Claim 7
Dependent Claim
39 words
Facsimile apparatus as claimed in claim 1, wherein said switching mask plate has a line raster, and further comprising a source of light of corresponding size, and optical system means for projecting the light spots produced onto the document.
Claim 8
Dependent Claim
25 words
Facsimile apparatus as claimed in claim 1, wherein the source of light and the switching mask plate are disposed in close proximity above the document.
Claim 9
Dependent Claim
35 words
Facsimile apparatus as claimed in claim 1, wherein the mask produces a single light spot which travels along a line and photosensitive element means for detecting the reflection of said light spot from said document.
Claim 10
Dependent Claim
21 words
Facsimile apparatus as claimed in claim 8, wherein the positions of the photosensitive element and the source of light are interchanged.
Claim 11
Dependent Claim
16 words
Facsimile apparatus as claimed in claim 8 wherein said photosensitive element means comprises a photoelectric cell.
References Cited (Backward Citations)
US3826865A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |