JP2514970B2 - Light emitting device - Google Patents

Description

The present invention relates to a light emitting device, and more particularly to a combined structure of a receptacle and a light emitting element.

(Prior Art) When optically coupling an optical fiber and a light emitting element, a spacer is interposed between the optical fiber and the light emitting element so that the coupling efficiency is maximized. Are connected to each other with the optimum distance between them maintained.

 FIG. 3 conceptually shows the light emitting device 1.

In the light emitting device 1, it is the simplest to employ the light emitting element 4 in which the lens 2 is integrated with the case 3, and to attach the light emitting element 4 to the receptacle (not shown) and connect it to the optical fiber 5. Become a structure. Such a light emitting device 1
Then, the distance from the chip 6 of the light emitting element 4 to the end face of the optical fiber 5 is maximized so that the coupling efficiency is maximized, that is, the light from the chip 6 is focused by the lens 2, and this total luminous flux is the end face of the optical fiber 5. For example, a spacer 7 having a thickness of 1 mm is interposed between the light emitting element 4 and the optical fiber 5 so as to be projected on.

On the other hand, as shown in FIG. 4, in the light receiving device 8, since the light receiving area of the chip 10 of the light receiving element 9 is relatively large, the light receiving element 9 and the optical fiber 11 are installed to face each other without a lens. . In such a light receiving device 8, the shorter the distance between the light receiving element 9 and the optical fiber 11, the better. However, if the light receiving element 9 and the optical fiber 11 are brought into close contact with each other, the abutting surface between the window glass 12 of the light receiving element 9 and the optical fiber 11 may be damaged, so that the light receiving element 9 and the optical fiber 11 may be damaged. An extremely thin spacer 13 having a thickness of, for example, about 250 μm is interposed therebetween.

(Problems to be Solved by the Invention) By the way, the light emitting element 4 and the light receiving element 9 are connected to the optical fibers 5 and 11 via the receptacles. The receptacle is a housing for fixing the receptacle to a device housing or the like and connecting a plug of an optical fiber cord, a sleeve for positioning a connector, a spacer and a light emitting element 4.
Alternatively, it is composed of parts such as a bush for positioning the light receiving element 9, and these are assembled in advance. Therefore, the receptacle used for the light emitting device 1 and the receptacle used for the light receiving device 8 have different thicknesses of the spacers 7 and 13, and therefore, must be prepared as a light emitting device receptacle and a light receiving device receptacle, respectively. I have to.

As described above, preparing the light-emitting device receptacle and the light-receiving device receptacle reduces productivity,
Management becomes complicated.

Therefore, an object of the present invention is to make a receptacle for a light emitting device and a receptacle for a light receiving device common, thereby improving productivity and facilitating management.

[Structure of Invention]

(Means for Solving Problems) In the light emitting device according to the present invention, another spacer unit is attached to the spacer of the light receiving device receptacle, and the light emitting element is attached to the light receiving device receptacle through the spacer unit. I am letting you.

(Operation) In the light emitting device according to the present invention, by adding a spacer alone having a predetermined thickness separately prepared for the light emitting device to the spacer of the receptacle for the light receiving device, the coupling efficiency between the optical fiber and the light emitting element is maximized. I am trying to become.

(Example) FIG. 1 shows a light emitting device according to the present invention, and FIG. 2 shows a light receiving device receptacle used in the light emitting device.

In FIG. 2, the housing 21 of the light-receiving device receptacle 20 has an annular partition wall 21a on the inner circumference of the middle portion, a flange 21b on the outer circumference of one end, and a male screw portion 2 on the outer circumference of the other end.
Has 1c. In addition, the annular partition wall 21 of the housing 21
A sleeve 22 is fitted and inserted in a, and the sleeve 22 is axially positioned by bringing its flange 22a into contact with the end surface of the annular partition wall 21a. And sleeve 22 and housing 21
The tubular member 23 is fitted in the annular recess defined by and. The tubular member 23 has a flange-shaped spacer 23a on its inner circumference. The spacer 23a has a thickness of about 250 μm. Further, a bush 24 is fitted on the inner circumference of the end of the tubular member 23.

In the light-receiving device receptacle 20 having the above-described structure, the light-receiving element 25 is mounted with the tip of the light-receiving element 25 inserted into the bush 24 and the tip of the light-receiving element 25 abutting the spacer 23a.

The light receiving device receptacle 20 is installed by fastening the housing 21 to a device housing or the like.

Then, the plug 27 accommodating the end portion of the optical fiber 26 is inserted into the sleeve 22, and the plug 27 is attached to the light receiving device receptacle 20 with the end surface of the plug 27 abutting against the spacer 23a.

The light emitting device 30 according to the present invention, as shown in FIG.
The above-described light-receiving device receptacle 20 is used, and a spacer unit 31 having a thickness of about 1 mm is attached to the receptacle 20.
The light emitting element 32 is attached via 1.

The spacer unit 31 has a diameter slightly smaller than the inner diameter of the bush 24 and has a hole larger than the hole 23b of the spacer 23a in the center.
31a is formed. The thickness of this spacer unit 31 is
It is preset so that the coupling efficiency is maximized.

In this light emitting device 30, the spacer single body 31 is fitted into the bush 24 of the light receiving device receptacle 20, and the spacer single body 31 is brought into close contact with the spacer 23a.
The tip of 2 is fitted in the bush 24, and the light emitting element 32 is fixed to the receptacle 20 for the light receiving device with the tip of the light emitting element 32 abutting against the spacer unit 31.

In the light emitting device 30 assembled in this way, the light emitting element 32
The lens 32a is positioned within the hole 31a of the spacer unit 31.

On the other hand, the plug 27 accommodating the end portion of the optical fiber 26 is mounted on the light receiving device receptacle 20 as described above. Therefore, the distance between the plug 27 and the light emitting element 32, that is, the distance between the end face of the optical fiber 26 and the chip 32b of the light emitting element 32 is uniquely determined by the spacer 23a and the spacer unit 31 so as to maximize the coupling efficiency. To be done.

〔The invention's effect〕

As described above, the light emitting device according to the present invention uses the receptacle for the light receiving device, and can be obtained by simply adding the spacer for the light emitting device thereto, and therefore, the receptacle for the light emitting device does not need to be specially manufactured, In addition, management can be rationalized.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a light emitting device according to the present invention, and FIG.
FIG. 3 is a vertical cross-sectional view showing a light-receiving device receptacle used in the light-emitting device, FIG. 3 is a vertical cross-sectional view conceptually showing the light-emitting device, and FIG. 4 is a vertical cross-sectional view showing the light-receiving device conceptually. It is a figure. 20: Receptacle for light receiving device, 23a: Spacer, 26
...... Optical fiber, 30 ...... Light emitting device, 31 …… Spacer alone, 31 a …… Hole, 32 …… Light emitting element, 32 a …… Lens, 32 b
...... Tips

Claims (1)

(57) [Claims] 1. A light emitting device, wherein another spacer alone is attached to the spacer of the receptacle for the light receiving device, and the light emitting element is attached to the receptacle for the light receiving device through the spacer alone.