US4497539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antireflection optical coating
Assignee: Konica Minolta Inc
•
Filing: 1982-10-06
•
Granted: 1985-02-05
•
Expires: 2002-10-06
Abstract
Abstract Recently, there has been the tendency to increasingly use optical machinery and devices which utilize optical parts made of synthetic resin. Since an antireflection coating film for these synthetic resin optical parts is high in adhesive strength and is hard, it is advantageous to use silicon oxide. Particularly, silicon monoxide (SiO) varies in refractive index by varying the evaporation condition, and therefore, it is possible to make use of such properties to produce a multi-layered antireflection coating film from a single evaporation material by varying the evaporation conditions.
Inventors
- 👤 Kunio Sakurai
- 👤 Hiroshi Ito
- 👤 Takashi Nozaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:56
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/28; G02B5/285; G02B5/286; C; C23; C23C; C23C14/00; C23C14/0021; G02B1/00; G02B1/10; G02B1/11; G02B1/113; G02B1/115
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
35 words
A multilayer antireflection film for optical parts made of synthetic resin consisting essentially of a plurality of superimposed evaporation films of silicon monoxide, each film having a different refractive index resulting from different evaporation conditions.
Claim 2
Dependent Claim
35 words
A multilayer antireflection film for optical parts made of synthetic resin consisting essentially of a plurality of superimposed evaporation films of silicon monoxide, each film having a different refractive index resulting from different evaporation conditions.
Claim 3
Dependent Claim
26 words
An antireflection film according to claim 1 characterized in that the refractive index of a first layer on the side of air is 1.50 to 1.55.
Claim 4
Dependent Claim
34 words
An antireflection film according to claim 2 having the following structure: ______________________________________
Refractive
Film
Index Thickness
______________________________________
First layer 1.50-1.55 λ/4
Second layer 1.75-1.83 λ/4
Third layer 1.60-1.68 λ/4
Substrate n.sub.s = 1.49-1.60
______________________________________
Claim 5
Dependent Claim
74 words
An antireflection film according to claim 2, having the following structure: ______________________________________
Refractive
Film
Index Thickness
______________________________________
First layer 1.50-1.55 λ/4
Second layer n.sub. 21 -n.sub.25
λ/2
Substrate n.sub.3 = 1.49-1.60
______________________________________ where n 21 : Refractive power of the second layer in a boundary with respect to the first layer: 1.80≦n 21 ≦1.85 n 2s : Refractive power of the second layer in a boundary with respect to the substrate: 1.60≦n 2s ≦1.68.
Claim 6
Dependent Claim
65 words
A multilayer antireflection film for optical parts made of synthetic resin which is composed of a plurality of superimposed evaporation films of silicon monoxide, each film having a different refractive index resulting from different evaporation conditions, said film having the following structure: ______________________________________
Refractive
Film
Index Thickness
______________________________________
First layer 1.50-1.55 λ/4
Second layer 1.75-1.83 λ/4
Third layer 1.60-1.68 λ/4
Substrate n.sub.s = 1.49-1.60
______________________________________
Claim 7
Dependent Claim
65 words
A multilayer antireflection film for optical parts made of synthetic resin which is composed of a plurality of superimposed evaporation films of silicon monoxide, each film having a different refractive index resulting from different evaporation conditions, said film having the following structure: ______________________________________
Refractive
Film
Index Thickness
______________________________________
First layer 1.50-1.55 λ/4
Second layer 1.75-1.83 λ/4
Third layer 1.60-1.68 λ/4
Substrate n.sub.s = 1.49-1.60
______________________________________
Claim 8
Dependent Claim
104 words
A multilayer antireflection film for optical parts made of synthetic resin which is composed of a plurality of superimposed evaporation films of silicon monoxide, each film having a different refractive index resulting from different evaporation conditions, said film having the following structure: ______________________________________
Refractive
Film
Index Thickness
______________________________________
First Layer 1.50-1.55 λ/4
Second Layer n.sub.21 -n.sub.2s
λ/2
Substrate n.sub.3 = 1.49-1.60
______________________________________ where n 21 : Refractive power of the second layer in a boundary with respect to the first layer: 1.80≦n 21 ≦1.85 n 2s : Refractive power of the second layer in a boundary with respect to the substrate: 1.60≦n 2s ≦1.68.
Claim 9
Dependent Claim
104 words
A multilayer antireflection film for optical parts made of synthetic resin which is composed of a plurality of superimposed evaporation films of silicon monoxide, each film having a different refractive index resulting from different evaporation conditions, said film having the following structure: ______________________________________
Refractive
Film
Index Thickness
______________________________________
First Layer 1.50-1.55 λ/4
Second Layer n.sub.21 -n.sub.2s
λ/2
Substrate n.sub.3 = 1.49-1.60
______________________________________ where n 21 : Refractive power of the second layer in a boundary with respect to the first layer: 1.80≦n 21 ≦1.85 n 2s : Refractive power of the second layer in a boundary with respect to the substrate: 1.60≦n 2s ≦1.68.
References Cited (Backward Citations)
US3356522A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-05 | 1988-08-06 | 1989-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-05 | 1992-08-06 | 1993-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-05 | 1996-08-06 | 1997-02-05 | $7700.00 | Window Closed / Lapsed |