Method and apparatus for making color cathode ray tube
Abstract
Abstract IN ORDER TO AVOID UNDESIRABLE LOSS OF COLOR DISPARITY IN THE PERFORMANCE OF A CATHODE RAY TUBE OF THE MULTIBEAM, MULTI-COLOR, SHADOW MASK TYPE, IT IS PREFERABLE TO LIMIT THE DIAMETER OF EACH COLOR DOT ON THE PHOSPHOR SCREEN. IN THE PROCESS OF FIXING PHOSPHOR DOTS ON A PHOSPHOR SCREEN INSIDE A FACE PLATE OF THE CATHODE RAY TUBE DURING THE FABRICATION THEREOF, A SPECIALLY SHAPED LIGHTEMITTING SOURCE IS EMPLOYED, IN ORDER TO LIMIT THE DIAMETER OF EACH PHOSPHOR DOT TO NO LARGER THAN THAT OF EACH APERTURE IN THE SHADOW MASK THROUGH WHICH ULTRAVIOLET RAYS STRIKE THE SCREEN TO FIX SAID DOT. SAID LIGHT-EMITTING SOURCE IS FORMED TO HAVE A LIGHT-EMITTING FACE WHICH IS SHAPED IN THE FORM OF A RING DISPOSED IN PARALLEL RELATIONSHIP WITH THE FACE PLATE AND WHICH IS FORMED ON THE TOP OF A LIGHT CONDUIT MADE OF A TRANSPARENT MATERIAL.
Inventors
- 👤 M Okamoto
- 👤 C Ninagawa
- 👤 S Ashizaki
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |