Notched fiber array illumination device

G - Physics – 02 – B

Patent

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Details

G02B 6/28 (2006.01) F21V 8/00 (2006.01)

Patent

CA 2245691

An optical fiber having a core is disclosed. A notch having first and second sides is formed in the fiber and extends into the core. At least the portion of the interior of the notch adjacent the first side has an index of refraction less than that of the core. Light travelling at a first angle to the fiber axis and striking the first side will be totally internally reflected if the first angle is greater than a predetermined angle. If the first angle is less than the predetermined angle, a portion of the light will enter the notch and emerge through the second surface making a second angle to the first surface, the second angle being greater than the first.

L'invention concerne une fibre optique avec un coeur. On forme dans la fibre une entaille ayant un premier et un second côté, et s'étendant jusque dans le coeur. Au moins la partie de l'intérieur de l'entaille adjacente au premier côté a un indice de réfraction inférieur à celui du coeur. La lumière qui se déplace en formant un premier angle par rapport à l'axe de la fibre et qui frappe le premier côté sera totalement réfléchie à l'intérieur si le premier angle est supérieur à un angle prédéterminé. Si le premier angle est inférieur à l'angle prédéterminé, une partie de la lumière va pénétrer dans l'entaille et ressortir par la seconde surface, en formant par rapport à la première surface un second angle supérieur au premier.

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