US3643014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pip recording apparatus
Assignee: Mpac Group PLC
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Filing: 1967-03-07
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Granted: 1972-02-15
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Expires: 1987-03-07
Abstract
Abstract This disclosure comprises the recording and/or storing of information received in the form of electrical signals by scanning and illuminating at least a portion of the surface of a PIP material with a constant intensity radiation beam and applying a varying potential to the illuminated surface in accordance with the electrical signals so as to selectively polarize the PIP material. PIP material is used herein is defined as any material capable of exhibiting ''''persistent internal polarization'''' under the influence of radiation and an applied electric potential.
Inventors
- 👤 Barnett Rosenberg
- 👤 Felix H Brown
- 👤 David Theodore Nels Williamson
- 👤 Walter H Bossons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:56
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/80; H04N1/00; H04N1/23; H04N1/29
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
223 words
Apparatus for recording information received in the form of electric signals, which apparatus comprises a movable member having an exteRior surface formed by a layer of PIP material, said PIP material being capable of selective polarization internally throughout the subsurface of the photoconductive layer, an electrically conductive support backing said layer, at least one electrode positioned adjacent to said surface, voltageapplying means connected to establish a potential difference between the electrode and the support so as to create an electric field through said surface, the electrode extending across the surface so that such electric field is at any instant effective over a zone of said surface, means for moving the member so that the whole of said surface passes through said field in successive zones, optical means arranged to produce a light beam and to deflect said beam cyclically along a portion of the zone subject to the electric field so as to scan said portion in synchronism with the operation of the moving means, said field electrode comprising an elongated member with a longitudinally extending slot and said optical means being arranged to direct the light beam through said slot and to deflect said beam cyclically along said slot, and means for applying the received signals to the voltage-applying means so as to vary the electric field in accordance with said signals.
Claim 2
Dependent Claim
223 words
Apparatus for recording information received in the form of electric signals, which apparatus comprises a movable member having an exteRior surface formed by a layer of PIP material, said PIP material being capable of selective polarization internally throughout the subsurface of the photoconductive layer, an electrically conductive support backing said layer, at least one electrode positioned adjacent to said surface, voltageapplying means connected to establish a potential difference between the electrode and the support so as to create an electric field through said surface, the electrode extending across the surface so that such electric field is at any instant effective over a zone of said surface, means for moving the member so that the whole of said surface passes through said field in successive zones, optical means arranged to produce a light beam and to deflect said beam cyclically along a portion of the zone subject to the electric field so as to scan said portion in synchronism with the operation of the moving means, said field electrode comprising an elongated member with a longitudinally extending slot and said optical means being arranged to direct the light beam through said slot and to deflect said beam cyclically along said slot, and means for applying the received signals to the voltage-applying means so as to vary the electric field in accordance with said signals.
Claim 3
Dependent Claim
15 words
Apparatus as claimed in claim 1, in which the movable member is a rotatable member.
Claim 4
Dependent Claim
53 words
Apparatus as claimed in claim 1, in which the optical means includes a mirror drum, said mirror drum comprising a series of plane mirrors and a common support, the plane mirrors being secured to the common support in such manner that the assembly in section or end view appears as a regular polygon.
Claim 5
Dependent Claim
70 words
Apparatus as claimed in claim 1, in which the movable member is a rotatable drum and the field electrode is disposed at a slight angle of skew to the axis of said drum, said angle being so related to the ratio of the speed of the drum and the speed of deflection of the light beam so that the successively scanned portions of the surface are parallel to said axis.
Claim 6
Dependent Claim
146 words
Apparatus as claimed in claim 4, including an ink reservoir adjacent to the surface of said drum, means for maintaining said reservoir, and hence ink therein, at a potential such that said ink is attracted to polarized areas of the surface of the drum, means for causing a continuous web of substrate material such as paper to pass through a transfer zone in which said web is in juxtaposition to the surface of the drum at a velocity equal to the peripheral velocity of said drum, means for applying an electric field to cause transfer of ink from the drum to the web, and cleaning means for the drum surface, the relative dispositions of the elements being such that upon rotation of the drum any point on the drum surface passes, in order, the field electrode, the ink reservoir, the transfer zone, and the cleaning means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |