Patent US4815807A successfully refreshed from Google Patents.
US4815807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collimator lens for optical fiber
Assignee: Mitsubishi Chemical Corp
•
Filing: 1987-09-11
•
Granted: 1989-03-28
•
Expires: 2007-09-11
Abstract
Abstract A collimator lens for an optical fiber is disclosed. The collimator lens comprises a cylindrical member having an effective radius R and effective axial length L. The cylindrical member is formed of optically transparent material having refractive index n 1 . The cylindrical member has one circular end portion provided with a connecting portion connectable with a light emitting end face of an optical fiber and the other circular end portion provided with a fresnel lens pattern having a positive focal length F. The focal length F, the effective length L, the effective radius R and the refractive index n 1 are satisfied with the following formula (I) and (II); F/L=tan {sin.sup.-1 (NA/n.sub.1 }/tan {sin.sup.-1 (NA)} (I) R≧L·tan {sin.sup.-1 (NA/n.sub.1)} (II) in which NA is numerical aperture of the optical fiber.
Inventors
- 👤 Yasuhiro Kaneko
- 👤 Tokihiko Masuzawa
- 👤 Masatoshi Takesue
- 👤 Mitsuo Mori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:19
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/26; G02B6/32
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
127 words
A collimator lens for an optical fiber comprising a cylindrical member having an effective radius R and effective length L, said cylindrical member being formed of optically transparent material having refractive index of n 1 , said cylindrical member having one circular end portion provided with a connecting portion connectable with an optical fiber, and the other circular end portion provided with a Fresnel lens pattern having a positive focal length F, said focal length F, said effective length L, said effective radius R and said refractive index n 1 being satisfied with the following formula (I) and (II); F/L=tan {sin.sup.-1 (NA/n.sub.1 }/tan {sin.sup.-1 (NA)} (I) R≧L·tan·tan {sin.sup.-1 (NA/n.sub.1) }(II) ps where NA is numeral aperture of said optical fiber and n 1 is greater than 1.3.
Claim 2
Dependent Claim
127 words
A collimator lens for an optical fiber comprising a cylindrical member having an effective radius R and effective length L, said cylindrical member being formed of optically transparent material having refractive index of n 1 , said cylindrical member having one circular end portion provided with a connecting portion connectable with an optical fiber, and the other circular end portion provided with a Fresnel lens pattern having a positive focal length F, said focal length F, said effective length L, said effective radius R and said refractive index n 1 being satisfied with the following formula (I) and (II); F/L=tan {sin.sup.-1 (NA/n.sub.1 }/tan {sin.sup.-1 (NA)} (I) R≧L·tan·tan {sin.sup.-1 (NA/n.sub.1) }(II) ps where NA is numeral aperture of said optical fiber and n 1 is greater than 1.3.
Claim 3
Dependent Claim
36 words
A collimator lens for an optical fiber as claimed in claim 1, wherein said cylindrical member is formed of a material selected from the group consisting of acrylic resin, polystylenic resin, siliconic resin and fluoric resin.
Claim 4
Dependent Claim
33 words
A collimator lens for an optical fiber as claimed in claim 1, wherein said optical fiber has a core formed of a material selected from the group consisting of polymethylmethacrylate, polystylene, and polycarbonate.
Claim 5
Dependent Claim
31 words
A collimator lens as claimed in claim 1 further comprising a matching liquid between a light emitting end face of said optical fiber and said connecting portion of said cylindrical member.
References Cited (Backward Citations)
US4050782A
Cited
US4178066A
Cited
US4147402A
Cited
US4253727A
Cited
US4389085A
Cited
US4531810A
Cited
US4461278A
Cited
FR2509054A1
Cited
US4534616A
Cited
US4427284A
Cited
US4544235A
Cited
JPS5938706A
Cited
JPS6135407A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-27 | 1992-09-26 | 1993-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-27 | 1996-09-26 | 1997-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-27 | 2000-09-26 | 2001-03-28 | $7700.00 | Window Closed / Lapsed |