Patent US3819942A successfully refreshed from Google Patents.
US3819942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regulated power supply for corona charging unit
Assignee: Savin Business Machines Corp
•
Filing: 1973-05-07
•
Granted: 1974-06-25
•
Expires: 1993-05-07
Abstract
Abstract A regulated power supply for the corona charging unit of an electrostatic copying machine in which the difference between a reference voltage derived from the supply mains and a voltage derived from a sample of the ionic current of the corona unit provides the input for a regulator which controls the amount of power supplied by a full wave rectifier connected to the supply mains to a D.C. converter which feeds a voltage doubler connected to the corona unit.
Inventors
- 👤 P Hastwell
- 👤 E Gliddon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:47
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0283; G03G15/0291
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
126 words
A corona discharge system for an electrostatic copying machine including in combination, a source of alternaTing current line voltage, means responsive to said source line voltage for producing a relatively low level direct current voltage, a voltage regulator adapted to be actuated to regulate said low level direct current voltage, means responsive to said regulated low level direct current voltage for producing a high level direct current corona voltage, a corona unit, means for applying said corona voltage to said corona unit to produce an ionic current therein, means for producing a sample voltage as a measure of said ionic current, a source of a reference voltage, and means responsive to the difference between said sample voltage and said reference voltage for actuating said voltage regulator.
Claim 2
Dependent Claim
126 words
A corona discharge system for an electrostatic copying machine including in combination, a source of alternaTing current line voltage, means responsive to said source line voltage for producing a relatively low level direct current voltage, a voltage regulator adapted to be actuated to regulate said low level direct current voltage, means responsive to said regulated low level direct current voltage for producing a high level direct current corona voltage, a corona unit, means for applying said corona voltage to said corona unit to produce an ionic current therein, means for producing a sample voltage as a measure of said ionic current, a source of a reference voltage, and means responsive to the difference between said sample voltage and said reference voltage for actuating said voltage regulator.
Claim 3
Dependent Claim
29 words
A system as in claim 1 in which said source of said reference voltage includes means responsive to said low level direct current voltage for producing said reference voltage.
Claim 4
Dependent Claim
31 words
A corona discharge system as in claim 1 in which said sample voltage producing means comprises variable resistance means and means for applying said ionic current to said variable resistance means.
Claim 5
Dependent Claim
56 words
A corona discharge system as in claim 1 in which said corona unit comprises a corona element and in which said sample voltage producing means comprises a conductive member positioned adjacent and in spaced relation to said corona element to receive a portion of the ionic current therefrom and a resistor connected to said conductive member.
Claim 6
Dependent Claim
46 words
A corona discharge system as in claim 1 in which said corona voltage producing means comprises a direct current converter responsive to said low level direct current voltage for producing a large alternating current voltage and a voltage doubler responsive to said large alternating current voltage.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |