JPS595845Y2 - optical fiber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical fiber fixing structure suitable for, for example, introducing into a package of a semiconductor light emitting device.

For example, when light generated by a semiconductor light emitting device is made to enter and propagate into an optical fiber, the end of the optical fiber is introduced into the package of the semiconductor light emitting device,
It is arranged to face the light emitting element.

In such a case, the optical fiber must be fixed to the package by some means, but since the optical fiber has an extremely small diameter and low mechanical strength, it is not possible to directly fix the optical fiber itself. Can not.

Therefore, generally, the optical fiber is inserted into a metal sleeve, the optical fiber is fixed at the end of the metal sleeve, and the metal sleeve is fixed to the package.

FIG. 1 shows a conventional example in which an optical fiber is fixed to an object to be attached via a metal sleeve.

In the figure, 1 is an optical fiber, 2 is a metal sleeve, and 3 is an optical fiber 1 and a metal sleeve 2.
and 4 indicate a part of the package of the semiconductor light emitting device to be attached.

However, such a fixing method has the following drawbacks.

(1) When the optical fiber 1 and the metal sleeve 2 are fixed using the brazing material 3, an external force is applied to the optical fiber 1, which often causes breakage accidents.

(2) When an external force is applied to the optical fiber 1 after fixation, it is likely to break near the brazing material 3, making it difficult to handle.

(3) The diameter of the optical fiber 1 is usually 100 [
μm], and the diameter of the metal sleeve 2 is slightly larger than that, so it is extremely difficult to uniformly apply the brazing material 3 around the optical fiber 1 at the end of the metal sleeve 2. During the work, the brazing material 3 tends to become larger than the outer diameter of the metal sleeve 2, which may cause problems in attaching it to the package.

The present invention is intended to solve the drawbacks described in (1) to (3) above with a simple structure when an optical fiber is fixed to an object to be attached via a metal sleeve. This will be explained in detail below.

The present invention provides a sleeve that has a hollow portion through which the optical fiber passes and a notch that reaches the hollow portion from the outside, and connects the optical fiber with a brazing material applied to the notch, and attaches the sleeve to the sleeve. It is characterized by being fixed to the body.

Next, one embodiment will be described with reference to FIG.

The metal sleeve 12 used in the present invention is, for example,
A notch 12A is formed approximately in the center.

The shape of the notch 12A is not particularly limited, but it must reach at least a hollow portion, and must be designed so as not to reduce the mechanical strength of the metal sleeve 12 as much as possible.

The optical fiber 11 is inserted into the metal sleeve 12, and the optical fiber 11 and the metal sleeve 12 are fixed by applying brazing material 13 at the notch 12A.

In this case, the brazing material 13 is filled into the notch 12A and is prevented from overflowing outside the metal sleeve 12.
Although it is necessary to prevent the metal sleeve from protruding beyond the outer diameter of the metal sleeve, the filling operation is easier than in the conventional example shown in FIG.

Thereafter, although not shown, the optical fiber 11 is introduced together with the metal sleeve 12 into, for example, a package of a semiconductor light emitting device, the tip of the optical fiber 11 is brought into contact with the light extraction part of the light emitting element, and the metal sleeve 12 is inserted into the package. Sleeve 12
It is sufficient to fix it to the package by brazing or the like.

Although carried out as described above, the effects obtained by the present invention, particularly the effect of preventing breakage of the optical fiber 11, are extremely significant from a practical point of view, and the reason thereof will be explained below.

The cause of the frequent occurrence of optical fiber breakage accidents in conventional technology is as follows, with reference to FIG.

First of all, breakage accidents are likely to occur during brazing fixing work.
When applying the brazing material 3, use the adhesion jig to attach the optical
This is natural because an external force is likely to be applied to the fiber 1 to bend it using the end of the metal sleeve as a fulcrum.

Furthermore, after fixing, the adhesive stress of the brazing material 3 is concentrated at the end 5, and the optical fiber 1
is firmly fixed at the end 5 of the brazing filler metal 3, so that the stress when the optical fiber 1 is bent due to an external force is concentrated in this part 5, and therefore, when an external force is applied, it is extremely easy to bend the optical fiber 1 at this part 5. This causes the optical fiber 1 to break.

On the other hand, with the fixing structure according to the present invention shown in FIG. 2, there is almost no risk of bending the optical fiber 11 significantly during the brazing process, and the process of applying the brazing material 13 itself is relatively easy. Of course, after the metal sleeve 12 is fixed by brazing, when the optical fiber 11 exposed to the outside is bent by an external force, the metal sleeve 12 is bent using the end of the metal sleeve 12 as a fulcrum, and bending stress is applied there. On the other hand, the brazing part is located away from the end of the metal sleeve 12, and therefore the adhesive stress is generated at a different position from the bending stress application part, which greatly reduces the chance of optical fiber breakage due to bending. It is something.

The present invention is an optical device that is fixed to the package of a semiconductor light emitting device and used when the tip of the device is brought into contact with the light emitting element.
Particularly effective as a fiber, but not limited to
It can be used in various applications where optical fibers must be fixed.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a conventional example, FIG. 2 is an explanatory diagram of an embodiment of the present invention, and FIG. 3 is a partially enlarged sectional view for explaining problems of the conventional example. In the figure, 11 is an optical fiber, 12 is a metal sleeve, f2A is a notch, and 13 is a brazing material.

Claims (1)

[Scope of utility model registration request] An optical fiber is inserted into the hollow part of a sleeve having a hollow part penetrating in the longitudinal direction and a cut arrow part reaching the hollow part from the outside, and the optical fiber is coupled to the sleeve by a brazing material at the cut arrow part. An optical fiber fixing structure, characterized in that the sleeve is fixed to an attached body.