Patent US3600625A successfully refreshed from Google Patents.
US3600625A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projection picture tube with rotating fluorescent screen
Assignee: Toshiba Corp
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Filing: 1969-08-26
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Granted: 1971-08-17
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Expires: 1989-08-26
Abstract
Abstract A projection picture tube comprising an evacuated envelope, an electron gun assembly disposed therein, a metal target member with a fluorescent film thereon which is to be scanned by electron beams emitted by the electron gun assembly, a motor for rotating the target member without causing the electron beams to be affected by an external magnetic field, and an optical system for enlarging the image produced on the fluorescent film.
Inventors
- 👤 Asahide Tsuneta
- 👤 Kuramatsu Hayakawa
- 👤 Shinichi Sawagata
- 👤 Masao Ando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:01
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/24; H04; H04N; H04N9/00; H04N9/12; H04N9/31
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
157 words
A projection picture tube comprising an evacuated envelope having a transparent faceplate, a bearing member fixed in the envelope, a rotary anode member rotatably coupled to the bearing member and having a central shaft, a motor disposed on the back portion of the envelope, coupling means airtightly coupling the motor and the central shaft of the anode member, said coupling means including an insulating crankshaft member coupled to the motor, a second crankshaft member coupled to the central shaft of the anode member, a universal joint coupling the crankshafts together, and bellows disposed airtightly on the back side of the envelope and surrounding the insulating crankshaft member, a fluorescent film formed on the surface of the rotary member which faces the faceplate, an electron gun assembly received in the envelope for impinging electron beams on the fluorescent film, and an optical system for enlarging and projecting an image produced on the fluorescent film by electron beam impingement.
Claim 2
Dependent Claim
157 words
A projection picture tube comprising an evacuated envelope having a transparent faceplate, a bearing member fixed in the envelope, a rotary anode member rotatably coupled to the bearing member and having a central shaft, a motor disposed on the back portion of the envelope, coupling means airtightly coupling the motor and the central shaft of the anode member, said coupling means including an insulating crankshaft member coupled to the motor, a second crankshaft member coupled to the central shaft of the anode member, a universal joint coupling the crankshafts together, and bellows disposed airtightly on the back side of the envelope and surrounding the insulating crankshaft member, a fluorescent film formed on the surface of the rotary member which faces the faceplate, an electron gun assembly received in the envelope for impinging electron beams on the fluorescent film, and an optical system for enlarging and projecting an image produced on the fluorescent film by electron beam impingement.
Claim 3
Dependent Claim
17 words
The projection picture tube according to claim 1 wherein said fluorescent film is a color fluorescent film.
Claim 4
Dependent Claim
85 words
The projection picture tube according to claim 2 wherein said fluorescent film includes a plurality of fluorescent areas formed from fluorescent materials displaying three primary colors, those of said areas which are associated with the same color being arranged at equal spacings, the boundary between adjacent areas being bent at intermediate points in a direction opposite to the rotating direction of the rotary member, so that each of said areas has a shape progressively broadening from the center to the periphery of the rotary member.
Claim 5
Dependent Claim
16 words
The projection picture tube according to claim 1 comprising an aluminum film on the fluorescent film.
Claim 6
Dependent Claim
15 words
The projection picture tube according to claim 1 wherein said motor is an air motor.
Claim 7
Dependent Claim
20 words
The projection picture tube according to claim 5 wherein said second crankshaft member is metal and said bellows is metal.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |