Multi-layer anti-reflection coating
Abstract
Abstract A non-absorbing, substantially colorless, multi-layer antireflection coating for use on a substrate having an index of refraction of 1.43 to 2.00 comprises a first layer of a low-index filming material deposited on the substrate and having a thickness less than lambda /4, a second layer of a high-index filming material deposited on the first layer and having a thickness of less than lambda /4, a third layer of a low-index filming material deposited on the second layer and having a thickness approximately between 5 lambda /16 and 7 lambda /16, a fourth layer of a high-index filming material deposited on the third layer and having a thickness of less than lambda /4, a fifth layer of a low-index filming material deposited on the fourth layer and having a thickness of less than lambda /4, a sixth layer of a high-index filming material deposited on the fifth layer and having a thickness of more than lambda /2, and a seventh layer of a low-index filming material deposited on the sixth layer and having a thickness of lambda /4, wherein lambda is a selected wavelength of near ultraviolet range to near infrared range.
Inventors
- 👤 H Ikeda
Bibliographic Details
Claims Analysis
Total Claims: 3References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |