JPS5890608A - Optical fiber with lens - Google Patents

Abstract

PURPOSE:To obtain a lens-attached optical fiber suitable for long-distance detection by tapering the tip of the internal hole 2 of a circumferentially thread-cut cylindrical body, bringing a lens ball into contact with the tapered part through a coil spring and the rear end of the lens ball into contact with the optical fiber, and adhering and fixing the fiber. CONSTITUTION:A tapered part 4 is provided atop of the internal hole 2 of a cylindrical body having a screw 5 at the outer circumference, and while a lens ball 6 is brought into contact with the tapered part 4, a coil spring 10 fitted around the armor of an optical fiber 7 is inserted into the internal hole 2 to bring the polished surface of the core material 9 into cntact with the rear end of the lens ball 6. An adhesive 11 is injected from the rear end of the internal hole 2 to stick an internal circumferential surface 3, the lens ball 6, core material 9, and the tip of the coil spring 10 into one body. Thus, a lens-attached optical fiber suitable for long-distance detection is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical 7-eye fiber with a V lens whose detection end is an optical fiber mainly used for photoelectric switches. The objective is to provide a suitable optical fiber with a lens.

The optical fiber of conventional photoelectric switches is made by inserting the optical fiber into the shoulder of the inner hole of a cylindrical body with a thread carved on the outer periphery, and exposing the core material of the optical fiber at one end of the inner hole. Because the material is relatively small in diameter, its light-gathering ability is low, and in the end it cannot be used as a photoelectric switch for short-range detection.

The present invention has been made to improve upon the above-mentioned conventional circumstances.

A dormitory embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

The cylindrical body 1 is made of an opaque material, and the inner peripheral surface 8 of the inner hole window forms a tapered taper 4 at one end, and a mounting screw 5 is cut on the outer periphery. be.

The lens sphere 6 is made of glass or synthetic resin and is formed into a spherical shape, and its diameter is smaller than the inner diameter of the #i inner hole 2 and larger than the minimum diameter of the Taber 4.

The optical fiber 7 has a protective sheath 8 covering a material 9. As shown in FIG.
and the core material 9 are polished together. This polishing is done with lens ball 60
It is preferable to match the curvature, but if the core material 9 has a small diameter, the polished surface will be flat and there will be no practical problem.

The outer diameter of the coil spring W is made to substantially match the inner diameter of the inner hole 2, and the inner diameter of the coil spring m is made to substantially match the outer diameter of the outer sheath 3 of the optical fiber sleeve.

And since it is a sphere, the lens ball 6 is assembled without considering the direction.
The lens ball 6 is brought into contact with the taber 4, the optical fiber is inserted into the inner hole 2 of the cylinder 1, and the polished surface of the core material 9 is brought into contact with the rear end of the lens ball 6. Next, remove the coil spring WL8
The tip of the coil spring 10 is inserted near the lens ball 6 11t or directly 771 by sliding it along the inner peripheral surface of the inner hole 2.
It is brought into contact with the rear of the ball 6. Since the rear end of the nine-coil spring W protrudes outward from the simple stop, it protects the light 7 eyelid 7 from excessive bending as shown in the figure.

When the adhesive U is injected from the rear end of the inner hole 8, the inner peripheral surface 8
．． The adhesive U flows along the gap between the eight parts of the outer cover s11 and the coil spring 10, and as shown in FIG. By fixing the members 908 and 908, the tip of the coil spring stirrup is also fixed at the same time to prevent it from escaping from the cylindrical body l.

In addition, the adhesive U should be injected into the wig and core material 9 of V lenses #6.
As long as it does not adhere to the contact surface with the fiber, you can do the injection work at any point.19 Either opaque or transparent adhesive can be used, and the coil spring theory is a protective layer for optical fiber putty. By applying force to the rear end of the KV lens #6 during assembly of the bottle (1), it is useful for temporary fixation until the adhesive U is fixed, and it is effective in aligning the centers of the core material and the lens ball 6. In addition, it acts to press the lens bulb against the taper 4 in order to prevent the adhesive U from leaking to the front surface of the lens bulb. Adhesive U also prevents water, oil, and dust from entering from the outside.

Figure J@1 shows an application example of the present invention, in which instead of a coiled spring, an inner cylinder made of a slightly elastic synthetic resin is used with an outer cover 8 and an inner shoulder surface l.
It is interpolated between , and has the same and dislike effect.

In addition, as shown in Fig. 4, the taper 4 can be eliminated or made into a very loose taper, and the lens ball 6 can be fitted loosely into the inner peripheral surface IK, as shown in Fig. 4 (m) and Ik). By moving the position of #6 to the front or middle of the cylinder l ([by being in the same room, the directivity angle of #71 light will change arbitrarily, so
Light with lens 7 with various directivity angles just by preparing one type of parts
Aipa can be produced.

Of course, since there is no inner cylinder, the cylinder 1 in Figure 4) and (b) can be made smaller, and if the cylinder 1 is made of medium or soft synthetic resin, it is possible to protect the outer cover 8 from bending. be.

As explained above, according to the present invention, a tapered taper 4 is formed at one end of the inner hole 2 of the cylindrical body l having a screw 6 carved on the outer periphery, and has a diameter smaller than the inner hole 2 and larger than the tip of the taper. The lens ball 6 is brought into contact with the taper 4, and the outer sheath 8 of the spring MIK optical fiber 7 is inserted into the inner circumferential surface 8 of the inner hole 2 of the cylinder l.
The core material 9 of the optical fiber 7, which is inscribed and held while protruding from the outer sheath, is brought into contact with the center of the rear end of the lens 1a6 and at least on the inner shoulder surface 1. The L/lens bulb 6 and the core material 9 are made up of 8 parts that are fixed with adhesive, and the lens LA6, which has a larger diameter than the 3 materials 9, increases the light gathering ability, making it possible to detect seconds and distances. In addition, since the core is fixed to the lens bulb 6, assembly is easy and the alignment is ensured even after assembly.Light is accurately transmitted and received to the core material 9 via the lens bulb 6, and can be used over long distances. Useful for detection. Also, coil splash I OK
This allows the outer jacket of the optical fiber 7 to be protected from excessive bending.

[Brief explanation of drawings]

1 to 3 show an embodiment of the present invention, and FIG. 1 is an exploded front view, and FIG. 8 is a cross-sectional and corrected side view. FIGS. 3 and 4) and 1ts) are cross-sectional front views of applied examples of the present invention. Cylinder, 2: Inner hole %l: Inner peripheral surface% 4: Taper, S: Screw, 6: Lens ball, D; Optical fiber, 8: Outer cover, 9: Core material, lQ::! Il spring, 11: @j1 adhesive. Patent applicant Matsushita Electric Works Co., Ltd. Attorney Toshimaru Takemoto (and 2 others)

Claims (1)

[Claims] (1) A tapered taper is formed at one end of the inner hole of the cylindrical body with a thread carved on the outer periphery, and a lens ball having a smaller diameter than the inner hole and a larger diameter than the tip of the taper is brought into contact with the taper. The outer sheath of the optical fiber is held inwardly in a coil spring fitted into the inner peripheral surface of the inner hole of the cylindrical body, and the core material of the optical fiber, which protrudes from the outer sheath, is brought into contact with the center of the rear end of the lens bulb. An optical fiber with a lens that has at least eight parts, the inner circumferential surface, the lens bulb, and the core material, fixed with an adhesive and has a temperature of °C.