JPS58181002A - Manufacture of optical fiber sheet laminated body - Google Patents

Abstract

PURPOSE:To obtain a laminated body which is arrayed at a fixed pitch vertically and horizontally so that it is not piled up like a bale, by arraying and fixing an optical fiber sheet on a spacer plate in parallel at a fixed pitch, thereafter, laminating this plate. CONSTITUTION:An optical fiber sheet is prepared by fixing plural optical fibers by resin on a plate on which a groove is provided at a prescribed pitch, or winding one optical fiber to a grooved drum, and cutting a part of said fiber after fixing it by resin. In case when this optical fiber is laminated successively through spacers 3, 5 and 7, and spacers 3, 5 and 7 which are plane, form a groove on one face, or form a groove on both faces, etc. are used. The optical fiber sheet is fixed to these spacers, and laminated successively, therefore, the optical fiber is not piled up like a bale.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing an optical fiber sheet laminate used in an optical sensor that uses optical fibers to read matters written on a flat surface such as a drawing.

As an optical sensor for reading drawings using optical fibers, a large number of optical fibers are arranged on one plane and their cross sections are arranged in a line, and the reflected light or transmitted light from the drawing to be read is converted into an on-off signal per fiber cross section. A reading method is known in which the data is taken out as . In such a reading method, at the other end of the optical fibers arranged in a line, that is, at the side from which ON and OFF signals are extracted, the cross section of the optical fiber group can be arranged regularly to match the light receiving element. It becomes necessary.

When trying to stack optical fiber array sheets at a fixed pitch, first arrange multiple optical fibers (1) horizontally at a fixed pitch,
It is fixed in sheet form with resin (2),
The fixing resin always undergoes curing shrinkage, and as shown in FIG. 1, the resin (2) decreases in volume between the optical fibers, creating a depression. Therefore, when these sheets are stacked and bonded with resin and layered at a predetermined pitch, the sheet-like optical fibers fall into the depressions of the lower sheet due to pressure from above, forming a bale stack as shown in Figure 2. Therefore, it was difficult to obtain a laminate arranged at a constant pitch in the vertical and horizontal directions. In particular, when the diameter of each optical fiber is 0.1 to 0.2 M, it is currently impossible to control the lamination pitch at all.

The inventor of the present invention has found a way to solve the above problem (as a result of study), he has found a method for accurately stacking optical fibers used on the signal extraction side using spacers. The invention involves arranging optical fibers vertically and horizontally at a regular pitch and stacking them, by arranging an optical fiber sheet formed by arranging a plurality of optical fibers in parallel at a constant pitch on a spacer plate having a predetermined thickness. This is a method for producing an optical fiber sheet laminate, which is characterized in that the optical fiber sheet laminate is fixed in such a manner as to be fixed, and then laminated regularly into a cough plate.

Hereinafter, the present invention will be specifically explained with reference to the drawings.

Fig. 3 is a perspective view of an optical fiber sheet formed by arranging a plurality of optical fibers (1) in parallel. Such optical fiber sheets can be made, for example, by guiding a plurality of optical fibers onto a plate with grooves engraved at a predetermined pitch and fixing them with resin, or by winding a single optical fiber around a grooved drum and then , can be obtained by fixing a portion with resin and then cutting it open.

When assembling a reading device using optical fibers, one end of the optical fiber sheet is arranged adjacently to a predetermined width at a predetermined pitch to form a light receiving portion.

The other end (Bl is laminated at a constant pitch to correspond to the light receiving element, but a spacer plate is inserted during lamination, or the laminated end (Bl is laminated after a spacer plate is bonded to the upper or lower part of the Bl), First, a rectangular cross section is obtained and then reduced or enlarged using an optical system to obtain a cross-sectional pitch that matches the arrangement pitch of the light receiving elements.

As shown in Fig. 4, the spacer plate to be inserted between the sheets may be one that has flat top and bottom surfaces (3), or one that has grooves (4) on one side at a predetermined pitch (5), or a spacer plate that is vertically opposed to each other. Grooves (6) at the predetermined arrangement pitch at the positions
(7) etc. are used. When stacking sheets using such a spacer plate, it is possible to prevent the fibers in the upper layer from falling into the depressions between the rutted fibers, resulting in stacking. Hereinafter, the method of the present invention will be specifically explained according to Examples.

Example 1 ■ 84 plastic optical fibers (varnished by Mitsubishi Rayon Co., Ltd.) with a diameter of 0.110 m were pulled out from the creel.
With a slight tension on the metal plate with grooves at a pitch of 0.125 mm, polyvinyl acetate dissolved in alcohol or adhesive was applied to the top of the plate while it was placed in the grooves for a distance of 50 m. was fixed. - This operation was repeated every 1001 in the longitudinal direction of the fiber to create a sheet having a fixed part of 50cs+ for every 100 (1! II), and then cut from the center of the fixed part to obtain the optical fiber sheet shown in This optical fiber sheet was placed in a room with a relative humidity of 65%.
After leaving it for 4 hours, the dimension between the fiber centers was a fixed width of 0.
．． 125mX 83 = approximately 0.0 for 10,375m.
It showed a contraction of 4% and became 10.330 proverbs.

■ On the other hand, cut a V-shaped groove (4) with a depth of about 0.125 m on an epoxy resin sheet with a thickness of 0.250 m.
82 markings are made at a pitch of m, and 20 markings are made in the longitudinal direction of the groove (4).
A spacer play [5] with a length of m was prepared.

■ To remove excess resin at both ends of the sheet consisting of 84 fibers obtained in
After forming a book sheet, the optical fibers (7) were fixed in the grooves (4) of the spacer plate (5) obtained in step (2) with an epoxy adhesive (8) as shown in FIG.

At this time, the distance between the fibers at both ends of the sheet consisting of 82 fibers is 0.
．． 125m x 81 The pressure makes it easy enough to fit the fibers into the grooves. The thickness of the sheet to which the spacer plate thus obtained was adhered was about 0.330 m.

While observing the fiber cross section of the spacer-equipped sheet obtained in step (2) with a magnifying glass, 100 sheets were laminated at a fixed pitch using epoxy resin adhesive to form a rectangular laminate to obtain a rectangular laminate with a lamination thickness of 33,311 mm. The cross section of this rectangular laminate is No.6I! i! ! As shown in , the horizontal dimension X is 10.118 m, and the height dimension Y is 33.
It was 03m.

(2) The rectangular laminate obtained in (2) was reduced in the X and Y directions using an optical system, and was able to be adapted to a light-receiving element having an arrangement pitch of 40 microns in each of the X and Y directions.

The spacer plate used in this example is shown in Figure 4 (middle), but to more easily obtain a rectangular laminate, a plate with grooves at the same positions above and below the plate as shown in Figure 4 (c) may be used. Preferably nine.

Further, a plate without grooves as shown in FIG. 4(A) can also be used satisfactorily, although lamination is difficult.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the fixed part of a sheet obtained by arranging optical fibers at a regular pitch and fixing them with resin, Figure 2 is a cross-sectional view of a laminate laminated in a bale shape, and Figure 3 is FIG. 4 is a perspective view of an optical fiber sheet arranged with both ends fixed. FIG. 4 is a perspective view of a spacer plate used in the present invention. FIG. 5 is an enlarged cross-sectional view of an optical fiber sheet fixed to a spacer plate. The figure is a sectional view of an optical fiber sheet laminate using the spacer plate of the present invention. In the figure: 1: Optical fiber 2: Adhesive 3.5.7: Baser plate rod, 4 [21 9

Claims (1)

[Claims] When stacking optical fibers by arranging them vertically and horizontally at a regular pitch, an optical fiber sheet formed by arranging a plurality of optical fibers in parallel is arranged at a constant pitch on a spacer plate having a predetermined thickness. 1. A method for producing an optical fiber sheet laminate, which comprises fixing the plates in a manner as described above, and then stacking the plates regularly.