JPH095600A - Attaching structure for metallic block - Google Patents

Abstract

PURPOSE: To provide attaching structure for a metallic block capable of reducing cost and improving reliability in fixing by welding. CONSTITUTION: Projected parts 21 and 22 having finished flat surfaces 21a and 22a at their tips are formed on the surfaces 2a and 2c of the metallic block 2 fixed in a case 1 in a surface-tight adhesion state. The finished flat surfaces 21a and 22a thereof are positioned by abutting on the opposed surfaces 1a and 1c on the case 1 side. Then, the case 1 is attached to the metallic block 2 by welding and fixing the projected parts 21 and 22 and the case 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure of a metal block for fixing optical functional components constituting an optical circuit module in a case.

[0002]

2. Description of the Related Art FIG. 4 is a schematic structural layout diagram showing an example of an optical circuit module in which optical functions are integrated. In FIG. 4, reference numeral 1 indicates, for example, stainless steel (SUS303, 304,
630) and other metal materials. The case 1 includes a front surface 1a, a rear surface 1b, left and right side surfaces 1c and 1d,
It has a bottom surface 1e and an upper surface (not shown), and is formed in a substantially hexahedral box shape. A metal block 2 made of the same stainless steel (SUS303, 304, 630) or the like is arranged in the case 1. In addition, the metal block 2 arranged in the case 1 has the front surface 2 of the metal block 2.
a is brought into contact with the front surface 1a of the case 1, and the side surface 2
It is fixed to the case 1 by abutting c on the side surface 1c of the case 1 and a bottom surface 2e (see FIG. 6) on the bottom surface 1e, and welding the surfaces in contact with each other. Further, the rear inclined surface 2b1 of the metal block 2
, 2b2 are provided with a λ1 pass filter 3 and a λ2 pass filter 4. On the other hand, outside the case 1, a fiber collimator 5 corresponding to the λ1 pass filter 3 and a fiber collimator 6 corresponding to the λ2 pass filter 4 are provided on the front surface 1a, and the λ1 pass filter 3 is provided on the rear surface 1b. A fiber collimator 7 is provided correspondingly, and a pin photodiode 8 is provided corresponding to the .lambda.2 pass filter 4 on the side surface 1d. Here, the fiber collimators 5, 6 and 7 are each formed of an optical fiber and a lens and form a parallel beam.

In this way, the optical functional elements (λ1 pass filter 3, λ2 pass filter 4) are attached to the metal block 2 and arranged in the spatial beam formed by the parallel beams of the fiber collimators 5, 6 and 7. The operation of the spatial optical circuit module will be described below. First, the light in which the wavelengths λ1, λ2, and λ3 are mixed is emitted from the fiber collimator 5 toward the λ1 pass filter 3. Then, this is the wavelength λ 1 and the wavelength λ 1 by the λ 1 pass filter 3.
2 and λ3. Of these, the light of wavelength λ1 is λ
The light passes through the 1-pass filter 3 and is guided to the fiber collimator 7. On the other hand, the light of wavelengths λ2 and λ3 that cannot pass through the λ1 pass filter 3 is reflected toward the λ2 pass filter 3 and is split into wavelengths λ2 and λ3 by the λ2 pass filter 4. And the demultiplexing here is that wavelength λ2 is λ2
The light passes through the pass filter 4 and is guided to the pin photodiode 8, and the wavelength λ3 is reflected by the λ2 pass filter 4 and guided to the fiber collimator 7.

[0004]

5 and 6 are similar to FIG.
5 schematically shows the mounting structure of the metal block 2 and the case 1 in the optical circuit module shown in FIG. 5, FIG. 5 is a top view thereof, and FIG. 6 is a sectional view taken along line CC of FIG. In this optical circuit module, when the metal block 2 is attached to the case 1, the front surface 2a of the metal block 2 is brought into contact with the front surface 1a of the case 1, the side surface 2c is the side surface 1c of the case 1, and the bottom surface 2e is the bottom surface 1e. The entire surfaces were brought into contact with each other, and the surfaces in contact with each other were welded to each other to be fixed. Therefore, the surfaces of the metal block 2 and the case 1 facing each other (front surface 2a and front surface 1a, side surface 2)
c, the side surface 1c, the bottom surface 2e, and the bottom surface 1e) are required to have accuracy such as verticality, horizontality, and flatness. Therefore, at least on the metal block 2 side, over a whole surface facing the case 1 (a surface that is scheduled to come into contact), a wide range of high accuracy (for example, verticality and flatness, the allowable value is 0.005). Processing is required. For this reason, it has been one of the reasons why the cost is high. If the processing accuracy is poor, for example, as shown in FIG.
As shown in FIG. 3, there is a problem that a gap δ is generated between the case 1 and the metal block 2 and a welding failure occurs when fixing by welding.

The present invention has been made in view of the above problems, and an object thereof is to provide a metal block mounting structure capable of reducing the cost and improving the reliability of fixing by welding or the like. To do.

[0006]

In order to achieve the above object, in the present invention, in a mounting structure for fixing a metal block to another member by bringing them into close contact with each other, the above-mentioned metals are fixed in close contact with each other. At least one surface of the block and the separate member is provided with a protrusion having a finish plane at the tip, and the finish plane of the protrusion is brought into contact with the opposing surface for positioning, and the protrusion and the It is configured to be fixed to another member and attached to the other member.

Further, in carrying out the present invention, it is better to provide the protruding portion on the side of the metal block, and it is more preferable to use welding fixing as means for fixing the contact portion between the protruding portion and the separate member. Further, it is also possible to provide an optical functional element on the metal block and use it as an optical circuit module.

[0008]

According to this structure, the metal block and another member to which the metal block is attached do not have to be subjected to finishing such as verticality and flatness over the entire facing surfaces.
It suffices to perform high-precision machining only on the finished flat surface of the protruding portion and the corresponding mating surface. Further, as the processing accuracy is improved, the gap δ or the like in the fixed portion is also eliminated, and thereby, defective welding can be reduced.

[0009]

Embodiments of the present invention will be described in detail below with reference to the drawings. 1 to 3 show an embodiment of the present invention. In this embodiment, like FIG. 5 and FIG.
The metal block 2 in the optical circuit module shown in FIG. 2 is attached to the case 1, and the case 1 and the metal block 2 are schematically shown. 3 is a top view thereof, FIG. 1 is a schematic sectional view taken along the line AA of FIG. 3, and FIG. 2 is a schematic sectional view taken along the line BB of FIG. Further, in FIGS. 1 to 3, the same reference numerals as those in FIGS. 4 to 6 correspond to those in FIGS. 4 to 6.

1 to 3, in the optical circuit module of the present embodiment, the metal block 2 attached to the case 1 has an upper portion of the front surface 2a of the metal block 2 which is in contact with the front surface 1a of the case 1, and the case. The protruding portion 21 that is laid horizontally in the left and right (in the case of the front surface 2a) and in the front-rear direction (in the case of the side surface 2c) on the upper portion of the side surface 2c of the metal block 2 that is brought into contact with the side surface 1c of the No. , 22
Are formed. Further, the front surfaces of the protrusions 21 and 22 are formed as finished flat surfaces 21a and 21b with which dimensional accuracy (for example, verticality and flatness, an allowable value is about 0.005 mm) is guaranteed for the case 1. There is. Therefore, when the finishing planes 21a and 21b are brought into contact with the front surface 1a and the side surface 1c of the case 1 which have been processed with increased dimensional accuracy, the metal block 2 can be positioned with respect to the case 1.

When the metal block 2 thus constructed is attached to the case 1, the finishing plane 2
1a and 21b are brought into contact with the corresponding front faces 1a and 1b of the case 1, and the abutting portions are welded and fixed by, for example, YAG welding. Then, the case 1 is fixed in a state where dimensional accuracy is guaranteed. 1 to 3 show a state in which the metal block 2 is attached to the case 1 in this way, and the dimensional accuracy is guaranteed, so that the dimensional accuracy and the optical accuracy of the optical circuit module are also improved.

Therefore, according to the structure of this embodiment,
The metal block 2 and another member to which the metal block 2 is attached, that is, the facing surfaces 1a, 1 of the case 1
Even if finish processing such as verticality, horizontality, and flatness is not performed over the entire c, the finished flat surface 2 of the protrusions 21 and 22.
1a, 22b and corresponding surface 1a on the case 1 side,
Since only 1c needs to be processed with high precision,
Processing becomes simple and cost can be reduced. Further, since the machining accuracy is improved, the gap δ and the like in the fixed portion are also eliminated.
It becomes easier to concentrate on a) and the weld fixing property is improved, whereby defective welding can be eliminated and reliability can be improved.

In the above embodiment, the structure in which the protrusions 21 and 22 are provided on the metal block 2 side is disclosed, but the structure may be provided on the case 1 side. Further, the positions where the protrusions 21 and 22 are provided are not limited to the positions in the above-described embodiment, and may be determined by the site where the case 1 and the metal block 2 are planned to be fixed.

[0014]

As described above, according to the present invention,
The finishing plane of the protruding portion and the finishing plane of the metal block and the other surface such as a case to which the metal block is attached are not subjected to finishing processing such as verticality, horizontality, and flatness over the entire facing surface. Since only the corresponding mating surface needs to be processed with high precision, the cost can be reduced and the cost can be reduced. Further, as the processing accuracy is improved, the gap δ and the like in the fixed portion are eliminated, welding defects can be eliminated, the yield can be improved, and the reliability is further improved.

[Brief description of drawings]

FIG. 1 is a sectional view taken along line AA of FIG.

FIG. 2 is a sectional view taken along the line BB of FIG.

FIG. 3 is a diagram showing one embodiment of the present invention.

FIG. 4 is a configuration layout diagram of main parts showing an example of an optical circuit module.

5 is a schematic layout diagram of a configuration of a main part of the module shown in FIG.

6 is a cross-sectional view taken along the line CC of FIG.

FIG. 7 is a diagram illustrating a problem of the conventional structure.

[Explanation of symbols]

 1 Case (separate member) 2 Metal Block 21 Projection 21a Finishing Plane 22 Projection 22a Finishing Plane

Claims (4)

[Claims] 1. A mounting structure for fixing a metal block to another member by bringing them into close contact with each other, and at least one surface of the metal block and the other member, which are fixed in close contact with each other, has a finish flat surface at its tip. A protrusion having the protrusion is provided, the finished flat surface of the protrusion is brought into contact with an opposing surface for positioning, and the protrusion and the separate member are fixed and attached to the separate member. Characteristic metal block mounting structure. 2. The mounting structure for a metal block according to claim 1, wherein the protrusion is provided on the metal block side. 3. The mounting structure for a metal block according to claim 1, wherein the protruding portion and the contact portion of the separate member are fixed by welding. 4. The metal block mounting structure according to claim 1, wherein the metal block is provided with an optical functional element forming an optical circuit module.