Patent US4794033A successfully refreshed from Google Patents.
US4794033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical joint comprising antireflection films
Assignee: Hamamatsu Photonics KK
•
Filing: 1986-09-17
•
Granted: 1988-12-27
•
Expires: 2006-09-17
Abstract
Abstract An optical joint for joining a first light transmissive material to a second light transmissive material. The joint comprises a transparent adhesive layer between the first and second materials, and an antireflection film between each of the first and second materials and the adhesive layer. The joint prevents Fresnel reflection which would otherwise occur between the light transmissive materials.
Inventors
- 👤 Yoshiharu Ooi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:42
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/10; G02B1/11; G02B1/113; G02B1/115; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
121 words
An optical joint for joining a first light-transmissive material having a refractive index n 1 , to a second light-transmissive material having a refractive index n 3 , comprising: a transparent adhesive layer, having a refractive index n 0 , adapted to be disposed between the first and second materials; a first antireflection film, having a refractive index between n 1 and n 0 , disposed between said adhesive layer and the first material; and a second antireflection film, having a refractive index between n 3 and n 0 , disposed between the adhesive layer and the second material, such that Fresnel reflection occurring at the interfaces between the adhesive layer and the first and second light-transmissive materials are substantially suppressed.
Claim 2
Dependent Claim
121 words
An optical joint for joining a first light-transmissive material having a refractive index n 1 , to a second light-transmissive material having a refractive index n 3 , comprising: a transparent adhesive layer, having a refractive index n 0 , adapted to be disposed between the first and second materials; a first antireflection film, having a refractive index between n 1 and n 0 , disposed between said adhesive layer and the first material; and a second antireflection film, having a refractive index between n 3 and n 0 , disposed between the adhesive layer and the second material, such that Fresnel reflection occurring at the interfaces between the adhesive layer and the first and second light-transmissive materials are substantially suppressed.
Claim 3
Dependent Claim
29 words
An optical joint according to claim 1, wherein said joint is adapted to transmit light of wavelength λ, and wherein said first and second layers have a thickness λ/4.
Claim 4
Dependent Claim
44 words
An optical joint according to claim 1, wherein said first film has a refractive index equal to about (n 0 .n 1 ) 1/2 , and wherein said second film has a refractive index equal to about (n 0 .n 3 ) 1/2 .
Claim 5
Dependent Claim
27 words
An optical joint according to claim 1, wherein one of said first and second materials comprises a material whose refractive index changes when voltage is applied thereto.
Claim 6
Dependent Claim
28 words
An optical joint according to claim 1, wherein one of said first and second materials comprises a material whose refractive index changes when mechanical stress is applied thereto.
Claim 7
Dependent Claim
38 words
An optical joint according to claim 1, wherin said first and second films comprise a material selected from the group consisting of: SiO, Al 2 O 3 , Gd 2 O 3 and Y 2 O 3 .
Claim 8
Dependent Claim
23 words
An optical joint according to claim 1, wherein said first material comprises LiNbO 3 , and wherein said second material comprises indium-tin oxide.
References Cited (Backward Citations)
US4313648A
Cited
US4556599A
Cited
US4532174A
Cited
US4581280A
Cited
US4637953A
Cited
US4637939A
Cited
US4628005A
Cited
US4640867A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-12-27 | 1992-06-27 | 1992-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-27 | 1996-06-27 | 1996-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-27 | 2000-06-27 | 2000-12-27 | $7700.00 | Window Closed / Lapsed |