Optical fiber image transmission element with square optical fiber structure

Abstract

The invention discloses an optical fiber image transmission element with a square optical fiber structure, comprising square single optical fibers, primary composite optical fibers and secondary composite optical fibers, wherein the glass end face of a square fiber core in each square single optical fiber is of a square with four vertex angles all being chamfered; the end face of each primary composite optical fiber is of a square and each primary composite optical fiber comprises a plurality of square single optical fibers closely arrayed in longitudinal and transverse directions, a space enclosed by any four square single optical fibers having common vertex angles forms a light absorption glass fiber jack, and a plurality of light absorption glass fibers can be inserted into the jack according to requirements; and the end face of each secondary composite optical fiber is of a cross shape and comprises a plurality of primary composite optical fibers closely arranged in a cross form, and a plurality of secondary composite optical fibers are jointed together and arranged in a combined shape of a cross and an H shape. The optical fiber image transmission element with the square optical fiber structure can be fabricated through adopting the traditional process and is high in CCD (Charge Coupled Device) coupling efficiency. Besides, the optical fiber image transmission element can be widely applied to the military industry and civil fields of low-level light imaging, high-speed photography, X-ray imaging and the like.

Description

technical field [0001] The invention relates to an optical fiber image transmission element. Background technique [0002] Optical fiber image transmission components are components arranged by optical fibers according to certain rules, which can transmit images from the input end face to the output end face. There are a wide range of applications. [0003] At home and abroad, the combination of rod and tube, fiber drawing, rod arranging and melting and pressing are generally used to make optical fiber image transmission components. Specifically, the optical fiber is drawn by combining a high-refractive-index core glass rod with a circular end face and a low-refractive-index fiber-coated glass tube to obtain a single optical fiber with a circular end face (all the following refer to optical fibers by shape, all are Refers to the cross section of the optical fiber); the single optical fiber is then arranged in rods, and every three circular single optical fibers form a cavi...

AI Technical Summary

Problems solved by technology

Due to the lack of corresponding processing methods and technologies in China, such as the lack of technology for making special-shaped optical fiber preforms and the lack of large-scale high-precision wire drawing equipment, etc., it is impossible to copy foreign processes

If the above-mentioned pentagonal core glass rod is produced first, and then the optical fiber image transmission element with a square optical fiber structure is produced by the traditional rod tube combination, optical fiber drawing, rod arrangement, and fusion pressing process, it is easy to encounter the following problems: For a single optical fiber, due to the irregular and symmetrical shape, the optical fiber is prone to twisting; when arranging a composite wire rod, because the single optical fiber of this shape has directionality and the wire diameter is small, it should be arranged in a square shape and the missing corner should be surrounded. It is very difficult to operate into a cavity; when arranging the molten pressing rod, because the secondary multifilament is square, it cannot be arranged into a regular hexagon, and the existing hexagonal mold cannot be used, so an octagonal hot-pressing mold can be made Requires a large investment; the produced product has severe shear distortion and cannot meet the index requirements

This shows that the square optical fiber structure adopted abroad is not suitable for traditional technology, and this structure cannot be used for mass production in China

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