JPS6156307A - Closed case for inserting optical parts - Google Patents

Abstract

PURPOSE:To prevent an ambient humidity from invading the inside of a case by a simple constitution, by stuffing an adhesive agent into a fitting part between the case and a cover, and also performing a coating to a fitting part between the case and an optical member inserted into the inside, and closing it up tightly. CONSTITUTION:An upper opening part 10' of a case 10 is provided on an external projecting position of a fiber core wire 4, and an upper projecting part 10'' is formed. A lower projecting part 11'' is formed in an inside position of the projecting part 10'' of a lower opening part 11' of a cover 11. Subsequently, an adhesitve agent 12 formed by an epoxy resin mixed with a powder made of aluminum, etc. is stuffed between the projecting part 10'' and 11''. As for a holder 13, the core wire 4 is penetrated in the inside peripheral surface, a groove 13'' is formed so as to have a gap in the tip of each projecting part 10'', 11'', on the outside peripheral surface, and the part between this groove 13'' and the tip of two projecting parts 10'', 11'' is coated with rubber 14. Accordingly, the case 10 and the cover 11 are sealed up tightly by the adhesive agent 12, and the penetrating part of the core wire 4 of the case 10 and the cover 11 is closed up tightly by the rubber 14. Therefore, an optical circuit in the case and the cover is cut off from the outside, and a bad influence caused by humidity from the periphery of the optical circuit can be prevented.

Description

Detailed Description of the Invention (Field of Application of the Invention) The present invention relates to a sealed case into which an optical circuit formed of an optical member such as a Rondo lens, an optical fiber, an optical filter, etc. is inserted, and in particular a sealed case suitable for improving moisture resistance. It's about the case.

(Background of the Invention) Optical circuits formed from conventional optical members are, for example, as described in Japanese Patent Application Laid-Open No. 12905/1983.
Multiple optical filters with bandpass characteristics that pass through different wavelength ranges are arranged in a row on two parallel surfaces of a glass substrate, and in the process of propagating light waves through repeated reflections between the two filter rows. A multi-channel low-loss optical demultiplexer that separates or combines lights of different wavelengths is used. In addition, in order to protect such optical circuits from the environment in which they are used,
Protective cases into which the above-mentioned optical circuits are inserted have conventionally been used. For example, as shown in FIG. 5, the upper part of the case 1 and the lid 2 are
', a rubber hood 3 for holding the fiber cord protruding outward from the side wall 1', a holder 5, and a flange 3.
′ and are all fastened with screws. However, the above configuration cannot be said to be sufficient to protect the internal optical circuit against changes in the surrounding environment.

Especially in a high humidity environment, as shown in FIG. 6, a rubber hood 3 and a flange 3' are used to protect the side wall 1' of the case 1 and the fiber core 4 extending outward from the side wall 1'. As shown by the W arrow, the ambient humidity between
Problems in which the adhesive penetrates into the case 1 and causes various adverse effects such as hygroscopic swelling of the adhesive, deterioration of the adhesive strength, peeling of the adhesive layer used in the optical circuit, and misalignment of the mounting position of the optical component. was there. Note that 5 shown in FIG. 6 is a holder, which is inserted between the fiber core 4 and the 7 flange 3'. A retaining ring 6 is inserted between the outer circumferential surface of the distal end of the holder 5 and the rubber hood 3 in order to hold one end of the tension member 7 on the outer circumferential surface of the distal end of the holder 5. A fiber jacket 8 is inserted into the tip of the rubber hood 3 so as to cover the outer periphery of the fiber core 4.

(Object of the Invention) An object of the present invention is to solve the above-mentioned conventional problems and provide a sealed case for inserting optical components that can prevent ambient humidity from entering the case with a simple structure. .

(Summary of the Invention) In order to achieve the above object, the present invention forms a fitting part between the case and the lid at a position where the fiber core protrudes outward, and applies moisture-resistant adhesive to the fitting part. The device is characterized in that the fiber cord supporting member is filled with a coating agent and the fitting portion between the case and the lid and the fiber cord support member is coated.

(Embodiments of the Invention) Hereinafter, FIGS. 1 to 4 showing embodiments of the present invention will be described. 1 is a perspective view of a sealed case for inserting optical components showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view of section A in FIG. 1, and FIG. 3 is an enlarged sectional view of section B in FIG. FIG. 4 is a diagram showing the average failure time of the conventional device and the device of the present invention, with the horizontal axis representing the test time hrs and the vertical axis representing the cumulative failure rate q.

It should be noted that parts that are the same as those in the prior art are indicated by the same reference numerals as in FIGS. 5 and 6.

In the figure, 10 is a case with an upper opening 10'
A protrusion 10 provided at a position where the fiber core 4 protrudes outward and protrudes upward from the upper opening 10'.
' is formed. 11 is a lid, and the lower opening 11
A protrusion 11' that protrudes downward is formed inside the protrusion 10'. 12 is made of adhesive such as epoxy mixed with aluminum powder,
The protrusion 10' of the case 10 and the protrusion 1 of the lid 11
1'. Reference numeral 13 is a holder, the inner peripheral surface of which is passed through the fiber core 4, and the outer peripheral surface of which the above-mentioned case 1 is inserted.
0 and the tip of the protrusion 10' of the lid 11 and the protrusion 11' of the lid 11.
grooves 13 into which the ends of the grooves are inserted so as to have a gap 13' between them.
' is formed inside this groove 13' and the two protrusions 10'.
, 11' is coated with rubber 14 between the ends. Reference numeral 15 is a ring, and one end of the tension member 7 is inserted between one end of the inner peripheral surface and the tip of the outer peripheral surface of the holder 13, and then an epoxy adhesive 16 is filled, and the inner peripheral An adhesive 17 of the same type as the adhesive 16 is filled between the other end of the surface and the outer circumferential surface of the fiber jacket 8, and between the outer circumferential surface and the rubber hood 3.

Because of the above configuration, the case 10 and the lid 11 are
It is sealed with an adhesive 12, the penetration portion of the fiber core 4 in the case 10 and the lid 11 is sealed with a rubber 14, and the gap between the fiber core 4 and the holder 13 is sealed with the adhesive 16, 17. and is isolated from the outside.

Therefore, as a result of an experiment conducted on the above-mentioned sealed container under conditions of a temperature of 50°C and a humidity of 95%, the mean failure time of the present invention, indicated by Δ in Figure 6, was approximately six times that of the conventional one, indicated by ○. ing.

(Effects of the Invention) As described above, the present invention has a simple structure, isolates the optical circuit inside the case and the lid from the outside, and prevents humidity from entering the case and the lid from entering the inside of the case and the lid. This can prevent the optical circuit from being adversely affected by humidity.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a sealed case for inserting optical components showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the □ section of Fig. 1, and Fig. 3 is an enlarged sectional view of the B section of Fig. 1. , the fourth prisoner has the exam time h on the horizontal axis.
5 is a perspective view of a conventional sealed case for inserting optical components, and FIG. A of
FIG. 1.10...Case, 2.11...Lid, 12...
・Adhesive, 13... Holder, 14... Rubber, 15.
...Ring, 16...Adhesive, 17...Adhesive. Agent Patent Attorney Tadashi Akimoto Figure 1 1; Figure 3 Figure 4 Test °M Saekaku ()-1r) Figure 5

Claims (1)

[Claims] 1. In a sealed case into which an optical circuit formed by an optical member such as a rod lens, an optical fiber, or an optical filter is inserted, fill the fitting part between the case forming the sealed case and the lid with adhesive. A sealed case for inserting an optical component, characterized in that a fitting portion between the case and the optical member is coated to make it airtight.