US3729257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means and methods for exposing photoelectrostatic materials
Assignee: AB Dick Co
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Filing: 1970-02-16
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Granted: 1973-04-24
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Expires: 1990-02-16
Abstract
Abstract Exposure of the conventional dye sensitized zinc oxide resin binder copy material is accomplished with a radiation source that emits a high level of energy at 535 nanometers. The photoelectrostatic copying method involves illuminating the original to be reproduced with a mercury-vapor type lamp which has been modified to include thallium vapors through the introduction of thallium halide into the lamp envelope. A high intensity green light is emitted which performs as a monochromatic energy source and finds particular application when reproducing originals having more than one color indicia thereon so that all colors are reproduced in accordance with their relative brightness on the original.
Inventors
- 👤 R Gunto
- 👤 M Staley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:54
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; G03G15/04036; G03G15/01; G03G15/0105; G03G15/011; G03G5/00; G03G5/02; G03G5/04; G03G5/09; H; H01; H01J; H01J61/00; H01J61/02; H01J61/12; H01J61/125
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
33 words
The apparatus as claimed in claim 1 wherein the ratio of the dominant energy emission to the secondary energy emission is in the range of from 4.5 : 1 to 7 : 1.
Claim 2
Dependent Claim
204 words
In apparatus for making copies of originals on copy material, comprising: a copy handling assembly including copy material charging, exposing and developing stations spaced along a path and copy material feeding means for feeding the copy material along the path, an illuminating station at which an original is illuminated to provide a lighT image that is applied to the copy material at the exposing station, a supporting means for receiving an original and mounted for movement from a normal position in which an original is supplied to a displaced position to move the original through the illuminating station as the supporting means moves from the normal position to the displaced position, the improvement wherein said illuminating station is equipped with an elongated tubular-shaped radiation source of the mercury vapor type having a thallium iodide additive, said radiation source having a dominant emission at 535 nanometers and a secondary emission at 546 nanometers, the ratio of the dominant energy emission to the secondary emission being in the range of 1.75:1 to 10:1, and a power supply connected to said radiation source for supplying energy thereto in the range of from 40 to 200 watts per lineal inch to be consumed by said tubular radiation source.
Claim 3
Dependent Claim
42 words
Apparatus as claimed in claim 3 wherein said radiation source is a mercury-thallium vapor lamp in which the dominant emission at 535 nanometers corresponds to the thallium energy line and the secondary emission at 546 nanometers corresponds to the mercury energy line.
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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |