US4815807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collimator lens for optical fiber
Assignee: Mitsubishi Chemical Corp
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Filing: 1987-09-11
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Granted: 1989-03-28
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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
2026-11-01 08:05
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.
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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 |