Patent ID: 11940658
Assignee: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An optical fiber module, comprising:
a plurality of first optical fibers collectively arranged to form at least one optical fiber bundle with a tapered end;
a second optical fiber connected to the tapered end of the optical fiber bundle to converge the optical fiber bundle to the second optical fiber;
a housing accommodating the optical fiber bundle with the tapered end and the second optical fiber and having a light-absorbing area corresponding to an end of the second optical fiber, wherein the second optical fiber is located between the optical fiber bundle and the light-absorbing area, and the light-absorbing area absorbs scattering signals escaped and scattered when signals are transmitted from the plurality of first optical fibers to the second optical fiber; and
a photoelectric sensor configured corresponding to the optical fiber bundle with the tapered end and arranged in the housing, wherein the photoelectric sensor receives target signals escaped and refracted when the signals are transmitted from the second optical fiber to the plurality of first optical fibers,
wherein a taper angle of the optical fiber bundle is less than twice a light incident acceptable angle of the second optical fiber, which satisfies a following formula:

0<α<2×[90°−θc]

wherein θc=sin−1 (1/n), θc represents a critical angle of light incidence satisfying a total reflection condition, and n is expressed as a refractive index of the first optical fibers, α is the taper angle, such that the critical angle of the light incidence is a total reflection angle of light transmitted in the second optical fiber.