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US 12,455,415 B2Granted
Signal light transmission member
AssigneeTamron Co., Ltd.
InventorHideki Nagano
Life of this patent
Estimating the term…
Abstract
A signal light transmission member includes an AR coated lens, a light transmission part, and an optical fiber. The refractive index of the light transmission part has a specific relationship with the refractive index of a core material of the optical fiber. An anti-reflective coating is formed at an interface portion between the lens of the AR coated lens and the light transmission part.
Claims9
A signal light transmission member comprising:
- a lens that has a refractive index n1 and is configured to collimate signal light;
- a housing part that houses the lens;
- a light transmission part that has light permeability, has a refractive index n2 smaller than n1, is made of a light transmission material filling the housing part, and has the lens embedded therein;
- an optical fiber through which the signal light passes, the optical fiber being inserted into the housing part and having an end portion fixed by the light transmission part at a position facing the lens on an optical axis of the lens in the housing part;
- and
- an anti-reflective coating that is formed at least at a portion of the optical path of the signal light at the interface between the lens and the light transmission part, wherein
- if the refractive index of a core material of the optical fiber is designated as n4, a following equation (1) is satisfied:
- n4−0.14≤n2≤n4+0.14 (1).
5 more elements
Dependencies are inferred from the claim text.