JP2541112Y2 - Optical fiber airtight adapter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an optical fiber connection adapter, and more particularly to an optical fiber airtight adapter for airtightly attaching a plurality of optical fibers.

(Prior Art) Conventionally, as a structure for airtightly coupling an optical fiber, a rod lens type and a fiber through type have been known.

In the rod lens type, as shown in FIG. 4, a rod lens 42 is inserted into a through hole formed in a wall 41. The rod lens is sealed by an O-ring 44 inserted into a concave groove 43 on the inner surface of the through hole. Light emitted from one of the transmission optical fibers 45 and 46 is focused by the rod lens and enters the other.

As shown in FIG. 5, in the fiber-slue type, an optical fiber 52 is inserted into a through hole formed in a wall 51, and is filled with an adhesive 53 and fixed in an airtight manner. 54 and 55 are fiber jackets.

All of these conventional examples have a structure that is difficult to assemble and disassemble, and cannot handle a multi-core optical fiber.

(Problem to be Solved by the Invention) The present invention solves the above-mentioned drawbacks and provides an optical fiber airtight adapter which has a simple structure with good airtightness and can handle a plurality of optical fibers. Is what you do.

(Means for Solving the Problems) The present invention provides an optical fiber hermetic adapter, in which a plurality of optical fiber mounting through holes, O-rings provided on a mounting surface, an adapter mounting portion, and a mounting portion of a second flange. A first flange having: a light transmitting glass fixed to the first flange via an O-ring on the first flange; and an optical fiber mounting through hole provided at a position corresponding to the through hole. An adapter mounting portion having a mounting portion between the hole and the first flange, the second flange being coupled to the first flange with the light transmitting glass interposed therebetween, and provided only on the first flange; The first and second flanges can be connected to each other by a fitting structure.

(Embodiment) FIG. 1 is a partial sectional view for explaining one embodiment of the present invention. In the figure, 1 is a first optical fiber mounting plate, 2 is a second optical fiber mounting plate, 3 is an external mounting flange, and 4,5.
Is a through hole, 6, 7 is a lens, 8, 9 is an optical fiber mounting auxiliary part,
10, 11 are optical fiber, 12 is light transmitting glass, 13 is internal concave groove, 14 is internal O-ring for airtightness, 15 is protective packing, 16 is glass holding ring, 17, 18 are mounting screws, 19 is external A concave groove, 20 is an O-ring for external airtightness, and 21 is a screw hole for mounting an adapter.

The first optical fiber mounting plate 1 is provided with a plurality of through holes 4 into which the optical fiber 10 can be inserted. The optical fiber may be the clad as it is, or the clad may be removed and inserted as only the core. It is preferable that the through hole 4 matches the diameter of the optical fiber to be inserted. In order to easily and surely insert and fix the optical fiber 10 into the through hole 4, the first optical fiber mounting plate 1 is provided with an optical fiber mounting auxiliary portion 8. Of course, the connector may be directly attached. A lens 6 is provided in the through hole 4. Since the mounting of the lens does not require airtightness, a rod lens, a ball lens, and other appropriate optical systems are used. Similarly, the second optical fiber mounting plate 2 is also provided with a plurality of through holes 5 having lenses 7, and the optical fiber 11 is inserted and fixed by the optical fiber mounting auxiliary part 9. The first optical fiber mounting plate 1 is fitted to the first inner peripheral surface 22 of the outer mounting flange 3 and mounted by screws 17. External mounting flange 3
The inner groove 13 is provided with an O-ring 14 for internal airtightness,
The light transmitting glass 12 is hermetically fixed by screwing an outer thread of the glass holding ring 16 to an inner thread of the outer mounting flange 3 and tightening the screw. Glass holding ring
The protective packing 15 made of Teflon or the like provided at 16 is for preventing the light transmitting glass 12 from being damaged. The second optical fiber mounting plate 2 is fitted to the second inner peripheral surface 23 of the outer mounting flange 3 by screws 18. An external airtight O-ring 20 is provided in the external groove 19 of the external mounting flange 3, and serves as an airtight seal when the optical fiber airtight adapter is mounted on the mounting body by the adapter mounting screw hole 21. Light emitted from one of the optical fibers attached to the first optical fiber attachment plate 1 and the second optical fiber attachment plate 2 is a light beam 24 collimated by one lens.
Then, the light passes through the light transmitting glass 12 and enters the other optical fiber via the other lens. In this case, the through hole
Since 4 and 5 are aligned, efficient optical coupling can be achieved.

In the case of one core, the center of the through hole can be assembled without adjustment by cutting with good concentricity on the center line.

Further, the inner peripheral surfaces 22 and 23 of the outer mounting flange 3 and the first and second optical fiber mounting plates 1 and 2 fitted thereto.
It is easy to manufacture the fitting surface of 2 with high accuracy, and therefore, accurate assembly is possible.

In this embodiment, an external mounting flange 3 is fixed to a first optical fiber mounting plate 1 with screws 17 to form a first flange, on which a second optical fiber mounting plate 2 is used as a second flange. Although the first optical fiber mounting plate 1 and the external mounting flange 3 may be integrally configured, they are assembled.

An example of a manufacturing process for accurately aligning the through holes of the first optical fiber mounting plate 1 and the second optical fiber mounting plate 2 in the above embodiment will be described with reference to FIG. 1A shows a shape in which a first optical fiber mounting plate 1 and a second optical fiber mounting plate 2 are integrated, and is manufactured as a rotationally symmetric body 25 by cutting or die casting. Next, as shown in FIG. 2B, through-holes 26, 26... Are opened and cut, to obtain two optical fiber mounting plates 1 and 2 shown in FIG. In this manufacturing method, since the alignment is perfect, a flange suitable for a multi-core structure can be manufactured.

FIG. 3 is another embodiment of the glass holding ring. 12
Is a light transmitting glass, and the outer mounting flange 3, the inner concave groove 13, and the inner airtight O-ring 14 may be the same as those in FIG. The glass press ring 31 is provided with an overhang portion 32 covering the periphery of the light transmitting glass, and a protective packing 33 is provided inside thereof.
Then, the periphery of the light transmitting glass is pressed down, and the light transmitting glass 12 is screwed to the external mounting flange with a screw 34, and the transmitting glass 12 is airtightly fixed.

By forming a film or the like having various optical characteristics on the light transmitting glass, it is possible to provide an attenuation characteristic and a wavelength selection characteristic.

(Effects of the Invention) As described above, according to the present invention, a plurality of optical fibers can be combined, and the airtight structure and the optical system are configured independently using the light transmitting glass. The design is easy and the hermetic structure is composed of an O-ring for internal airtightness and an O-ring for external airtightness.
It can be easily achieved with only two O-rings with a ring. In addition, by providing the adapter mounting portion only on the first flange and mounting it on the body to be mounted, the second flange is separated from the first flange while the first flange is mounted on the body to be mounted. In addition, since the light transmitting glass is fixed to the first flange via the O-ring, there is an effect that airtightness can be secured even if the second flange is separated.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of an embodiment of the present invention, and FIG.
FIG. 3 is a partial sectional view of a main part of another embodiment, and FIGS. 4 and 5 are sectional views of a conventional example. 1,3 ... first flange, 2 ... second flange, 4,5 ...
… Through-hole, 6,7 …… lens, 10,11 …… optical fiber, 12…
... Glass for light transmission, 14 ... O-ring for internal airtightness, 20 ...
... O-ring for external airtightness.

Claims (1)

(57) [Scope of request for utility model registration] 1. A first flange having a plurality of optical fiber mounting through holes, an O-ring provided on a mounting surface, an adapter mounting portion and a second flange mounting portion, and a first flange formed on the first flange. A light-transmitting glass fixed to the first flange via an O-ring, and an attachment portion between the first flange and an optical fiber attachment through-hole provided at a position corresponding to the through-hole; A second flange coupled to the first flange with the light transmitting glass interposed therebetween, wherein the second flange is attached to the body by an adapter attaching portion provided only on the first flange. And optical fiber airtight adapter.