US3673599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic printing apparatus
Assignee: Sharp Corp
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Filing: 1970-07-29
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Granted: 1972-06-27
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Expires: 1990-07-29
Abstract
Abstract The printing apparatus has a new type of cathode ray tube which utilizes electrostatic charge deposition. The tube contains a single continuous dielectric plate which forms its face plate. Charges are deposited only on a portion of the dielectric plate where the electron beam strikes and then transferred through the air gap from the dielectric plate to paper by a means of discharge caused by potential difference across the air gap.
Inventors
- 👤 Takao Tagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:43
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/32; G03G15/321
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
116 words
An electrostatic printing apparatus comprising: a cathode ray tube containing an electron gun, an electron scanning means and a continuous target member which is composed of a single dielectric material said target having a resistivity in a range from about 107 to about 1012 ohm-centimeters, the continuous target being scanned by electrons from the electron gun so that charge is deposited only on a portion of the target where the electron beam strikes, a dielectric recording sheet traveling in front of the continuous target, and a gaseous gap layer between the continuous target and the recording sheet through which the charge patterns on the continuous target are transferred to the recording sheet by means of discharge.
Claim 2
Dependent Claim
116 words
An electrostatic printing apparatus comprising: a cathode ray tube containing an electron gun, an electron scanning means and a continuous target member which is composed of a single dielectric material said target having a resistivity in a range from about 107 to about 1012 ohm-centimeters, the continuous target being scanned by electrons from the electron gun so that charge is deposited only on a portion of the target where the electron beam strikes, a dielectric recording sheet traveling in front of the continuous target, and a gaseous gap layer between the continuous target and the recording sheet through which the charge patterns on the continuous target are transferred to the recording sheet by means of discharge.
Claim 3
Dependent Claim
32 words
An electrostatic printing apparatus according to claim 1 which comprises means of developing the charge patterns on the recording sheet with toner and means of fixing the toner on the recording sheet.
Claim 4
Dependent Claim
120 words
An electrostatic printing apparatus comprising: a cathode ray tube containing an electron gun, an electron scanning means and a continuous target member which is composed of a single dielectric material a surface of the dielectric target being painted with materials having a resistivity of about 107 - 1012 ohm-centimeters, the continuous target being scanned by electrons from the electron gun so that charge is deposited only on a portion of the target where the electron beam strikes, a dielectric recording sheet traveling in front of the continuous target, and a gaseous gap layer between the continuous target and the recording sheet through which the charge patterns on the continuous target are transferred to the recording sheet by means of discharge.
Claim 5
Dependent Claim
120 words
An electrostatic printing apparatus comprising: a cathode ray tube containing an electron gun, an electron scanning means and a continuous target member which is composed of a single dielectric material a surface of the dielectric target being painted with materials having a resistivity of about 107 - 1012 ohm-centimeters, the continuous target being scanned by electrons from the electron gun so that charge is deposited only on a portion of the target where the electron beam strikes, a dielectric recording sheet traveling in front of the continuous target, and a gaseous gap layer between the continuous target and the recording sheet through which the charge patterns on the continuous target are transferred to the recording sheet by means of discharge.
Claim 6
Dependent Claim
115 words
An electrostatic printing apparatus comprising: a cathode ray tube containing an electron gun, an electron scanning means and a continuous target member which is composed of a single dielectric material, the continUous target being scanned by electrons from the electron gun so that charge is deposited only on a portion of the target where the electron beam strikes, a dielectric recording sheet traveling in front of the continuous target, a gaseous gap layer between the continuous target and the recording sheet through which the charge patterns on the continuous target are transferred to the recording sheet by means of discharge and a spacer laid between the surface of the target and the dielectric recording sheet.
Claim 7
Dependent Claim
115 words
An electrostatic printing apparatus comprising: a cathode ray tube containing an electron gun, an electron scanning means and a continuous target member which is composed of a single dielectric material, the continUous target being scanned by electrons from the electron gun so that charge is deposited only on a portion of the target where the electron beam strikes, a dielectric recording sheet traveling in front of the continuous target, a gaseous gap layer between the continuous target and the recording sheet through which the charge patterns on the continuous target are transferred to the recording sheet by means of discharge and a spacer laid between the surface of the target and the dielectric recording sheet.
Claim 8
Dependent Claim
24 words
An electrostatic printing apparatus according to claim 4 which comprises a conducting film being laid between the surface of the target and the spacer.
Claim 9
Dependent Claim
50 words
An electrostatic printing apparatus according to claim 5 in which the spacer is cut in such a way that one end of the spacer is positioned in the vicinity of the center line of the scanning beam, thus allowing creepage discharge to occur along the end face of the spacer.
References Cited (Backward Citations)
US3001849A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |