Patent EP0527239A1 successfully refreshed from Google Patents.
EP0527239A1
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Manufacturing method of a graded index type optical transmission element
Assignee: Mitsubishi Chemical Corp
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Filing: 1992-02-26
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Granted: —
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Expires: 2012-02-26
Abstract
Abstract An optical transmitter having a radius (r₀) of 0.45 ± 0.1 mm and made of a graded index plastic, wherein a refractive index distribution within the range of at least 0.2 r₀ to 0.8 r₀ exhibits a distribution approximate to an optimum quadratic curve which makes a mode dispersion minimum. It has a demodulation transfer factor, which represents resolution, of at least 60 %, and is suitable for image transfer in a copying machine, a facsimile, an image sensor, etc. The present invention relates also to a method of producing an optical transmitter obtained by removing a predetermined amount of the outer periphery of a graded index type optical transmitter preform.
Inventors
- 👤 Yoshihiro Otake Plants Uozu
- 👤 Kouzou Otake Plants Mise
- 👤 Nobuhiko Otake Plants Toyoda
- 👤 Yoshihiko Otake Plants Hoshide
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 10:50
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/02; G02B6/02033; G02B6/02038; G02B3/00; B; B29; B29D; B29D11/00; B29D11/00663; B29D11/00721; G02B3/0087
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
187 words
Graded index type optical transmission mediums characterized by being optical transmission mediums which have a circular cross section with a radius r₀ in the range of 0.45 ± 0.1 mm, and characterized by a refractive index distribution in the range of at least 0.25 r₀ ∼ 0.8 r₀ going from the central axis portion to the peripheral surface of said optical transmission medium that provides a refractive index distribution close to the refractive index distribution curve stipulated in Formula (1) below. n(r) = n₀ {1-(g²/2)r²} (1) (In the above described formula, n₀ is the refractive index of the central axis portion of said optical transmission medium, and is an optional value in the range of 1.5 ± 0.1; n(r) indicates the refractive index of the portion positioned at a distance r in the direction of the outer periphery from the central axis portion of said optical transmission medium; g indicates the refractive index distribution constant of said optical transmission medium and is a value of 0.3 ∼ 0.7; and r indicates the distance in the peripheral direction from the central axis portion of said optical transmission medium.)
Claim 2
Dependent Claim
65 words
Graded index type plastic optical transmission mediums as claimed in Claim 1, characterized by a refractive index distribution in the range of at least 0.25 r₀ ∼ 0.85 r₀ going from the central axis portion to the peripheral surface of the plastic optical transmission mediums that provides a refractive index distribution close to the refractive index distribution curve stipulated by the above mentioned Formula (1).
Claim 3
Dependent Claim
215 words
A manufacturing method for the graded index type plastic optical transmission mediums as claimed in Claim 1, characterized by having graded index plastic optical transmission medium preforms which have a circular cross-section with a radius in the range of 0.5 ± 0.1 mm, and characterized by eliminating the outer periphery of the optical transmission medium preforms in which the refractive index distribution in the range of at least 0.25 L₀ ∼ 0.70 L₀ going from the central axis portion to the peripheral surface of said optical transmission medium preforms provides a refractive index distribution close to the refractive index distribution curve stipulated in Formula (2) below. n(L) = N₀{1 - (g²/2)L²} (2) (In the formula above, N₀ is the refractive index of the central axis portion of said optical transmission medium preform, and is an optional value in the range of 1.5 ± 0.1; n(L) indicates the refractive index of the portion positioned at a distance L in the direction of the outer periphery from the central axis portion of said optical transmission medium preform; g indicates the refractive index distribution constant of said optical transmission medium preform, and is a value of 0.3 ∼ 0.7; and L indicates the distance in the peripheral direction from the central axis portion of said optical transmission medium.)
References Cited (Backward Citations)
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