JP7595478B2 - Manufacturing method of the joint body - Google Patents

Description

The present invention relates to a method for manufacturing a bonded body.

The technique of joining two or more components with a bonding material placed between the components is widely used.

For example, in the optical unit of Patent Document 1, the optical member is housed in a cylindrical frame and soldered to join the cylindrical frame and the optical member.

This optical unit uses a cylindrical frame and a columnar optical member, and a recess is formed on one end of the cylindrical frame, the inner diameter of which is larger than that of the other end. When joining the optical member to the cylindrical frame, the cylindrical frame is placed upright with the recess facing upward, and the optical member is accommodated in the recess of the cylindrical frame. At this time, a gap is formed between the inner surface of the recess and the outer circumferential surface of the optical member. A ring-shaped bonding material made of a solder material is placed on the annular surface of the cylindrical frame so as to cover the upper opening of this gap. At this time, the tip surface of the optical member accommodated in the recess of the cylindrical frame protrudes a predetermined amount from the annular surface of the cylindrical frame, and the ring-shaped bonding material placed on the annular surface of the frame is inserted so that its inner circumferential surface faces the outer circumferential surface of the optical member protruding from the frame with a predetermined gap.

Then, a load is applied to the optical member using a jig to press the optical member against the annular bottom surface of the recess in the cylindrical frame, and in this state, the optical member, cylindrical frame, and bonding material are placed in a heating furnace. When the bonding material is heated in the heating furnace, it melts, and a predetermined amount of the molten solder material fills the gaps, with the remaining solder material remaining on the annular surface of the cylindrical frame. The bonding material is then cooled and solidified to bond the optical member to the cylindrical frame.

JP 2006-288423 A

When two components are joined with a bonding material, if the bonding material is placed on one of the components and then put into a heating furnace, the bonding material may shrink as it is heated and move over the components, landing on the optical component. For example, in the bonding between an optical component and a frame described in Patent Document 1, the tip surface of the optical component protrudes a certain amount from the annular surface of the frame, and the inner periphery of the annular bonding material is inserted into the protruding portion of the optical component before the bonding material is placed on the annular surface of the frame. Therefore, the protruding portion of the optical component restricts the movement of the shrunk bonding material, and the bonding material does not run over the optical component. However, if the optical component does not protrude from the tip surface of the frame on which the bonding material is placed, and there is nothing to restrict the riding of the shrunk bonding material, the shrunk bonding material will ride over the optical component. If the bonding material is melted and joined to each component in a state where it is riding over the optical component, there will be a problem that the bonding position of the bonded body is shifted, the bonding strength is insufficient, and when multiple bonded bodies are manufactured, the bonding material has a difference in external shape between each bonded body, which impairs the reliability of the bonded body.

The present invention was made in consideration of the above-mentioned problems, and aims to provide a method for manufacturing a joint in which two or more members are joined with a joining material, which can ensure the reliability of the joint.

A method for manufacturing a joint in which a first part and a second part are joined by a joining material, the first part having a tip outer surface portion formed on a joining surface with the joining material such that the width dimension from the tip portion gradually widens outward, the method for manufacturing a joint comprising the steps of placing a joining material to be the joining material on the tip outer surface portion of the first part, placing the second part on the first part, and melting and solidifying the joining material to join the first part and the second part. The tip outer surface portion of the first part has at least one step portion. The tip outer surface portion of the first part is an inclined surface. The first part is cylindrical with a recess at the tip of the joining surface, the second part is cylindrical, and the second part is accommodated in the recess of the first part. The joining material is melted and filled between the inner surface of the recess and the outer circumferential surface of the second part to join the first part and the second part.

The manufacturing method of the bonded body of the present invention can ensure the reliability of the joint in a bonded body in which two or more members are bonded with a bonding material.

1A and 1B are diagrams showing an embodiment of a bonded body of the present invention, in which (a) is a plan view of the bonded body, and (b) is a cross-sectional view taken along line AA of (a). 5A and 5B are diagrams showing a blocking member, in which (a) is a plan view of the blocking member, and (b) is a cross-sectional view taken along the line AA of (a). 1A and 1B are diagrams showing a frame, in which (a) is a plan view of the frame, and (b) is a cross-sectional view taken along the line AA of (a). 5A to 5C are schematic diagrams illustrating a method for producing a bonded body. 1A and 1B are diagrams showing a joining member, in which (a) is a plan view of the joining member, and (b) is a cross-sectional view taken along the line AA of (a).

Below, an embodiment of the present invention will be described with reference to the drawings. In the drawings, the scale and number of each structure may differ from the actual shape and structure in order to make each component easier to understand. FIG. 1 shows an embodiment of a joint of the present invention, where (a) is a plan view of the joint and (b) is a cross-sectional view of A-A in (a). The joint 10 comprises a cylindrical frame 12 (first component 12) and a cylindrical blocking member 11 (second component 11) attached to one end of the frame 12 via a bonding material 13.

2 shows the blocking member, (a) being a plan view of the blocking member, and (b) being a cross-sectional view taken along the line A-A of (a). The blocking member 11 is a cylindrical member made of a translucent material such as glass or quartz. Although not shown, a metal film is formed on the outer peripheral surface (side surface) of the blocking member 11 to improve the wettability of the bonding material 13. The metal film is composed of a laminated film of a Ni film as a base layer and an Au film as a surface layer. The metal film is not limited to a laminated film of a Ni film and an Au film, and can be appropriately selected in consideration of the adhesion with the blocking member 11 and the bonding material 13. In this embodiment, the blocking member 11 has an outer diameter of 5 mm and a height of 1 mm.

3 is a diagram showing the frame, (a) is a plan view of the frame, and (b) is an A-A cross-sectional view of (a). The frame 12 is cylindrical and made of, for example, a stainless steel member. The frame 12 has a through hole 12b along the central axis, and a recess 12c is formed coaxially with the through hole 12b, with a diameter larger than the diameter of the through hole 12b, in the annular tip surface 12a, which is the tip portion on one end side of the frame 12. The annular tip surface 12a is processed by laser or sandblasting to form a tip outer surface portion in which the dimension in the width direction of the annular tip surface 12a (direction perpendicular to the central axis of the frame 12) is gradually wider toward the outside. The tip outer surface portion here consists of two step portions formed in the width direction of the annular tip surface 12a. Although not shown, a metal film is formed on the inner surface of the recess 12c of the frame 12, the annular tip surface 12a, and the step portion to improve wettability with the bonding material 13. The metal film is composed of a laminated film of a Ni film as a base layer and an Au film as a surface layer. The metal film is not limited to a laminated film of Ni film and Au film, and can be appropriately selected in consideration of the adhesion with the blocking member 11 and the bonding material 13. In this embodiment, the outer diameter of the frame body 12 is 6 mm and the height is 12 mm, the inner diameter of the recess 12c is 5.2 mm and the height is 1 mm, the inner diameter of the through hole 12b is 4 mm, the width dimension of the two steps formed in the width direction on one side of the annular tip surface 12a is approximately 0.1 mm, and the height between the steps is approximately 0.2 mm.

In the joint 10, the blocking member 11 is accommodated in the recess 12c of the frame 12, and the blocking member 11 and the frame 12 are joined by a joining material 13. The joining material 13 is AuSn solder, which spreads over the metal film formed on the outer peripheral surface of the blocking member 11 and the metal film formed on the inner surface of the recess 12c of the frame 12, the annular tip surface 12a, and the step portion, and also bridges between the respective metal films, joining the blocking member 11 and the frame 12 so that no atmospheric components enter from one side of the joint between the blocking member 11 and the frame 12, i.e., no leaks occur.

Next, a method for manufacturing the bonded body 10 described above will be described. FIG. 4 is a schematic diagram showing a method for manufacturing the bonded body of the present invention. The bonded body 10 is manufactured by the following steps.

[Frame placement step: FIG. 4(a)]
First, a tray 14 having a container 14a corresponding to the outer shape of the frame 12 is prepared, and the frame 12 is placed upright in the container 14a with the recess 12c facing upward.

[Closure member placement step: FIG. 4(b)]
Next, the blocking member 11 is placed in the recess 12c of the frame body 12. At this time, since the outer diameter of the blocking member 11 is smaller than the inner diameter of the recess 12c, the blocking member 11 is accommodated in the recess 12c with a predetermined gap formed between the outer peripheral surface of the blocking member 11 and the inner surface of the recess 12c.

[Joint member placement step: FIG. 4( c )]
Next, the joining member 13a is placed on the step portion of the annular tip surface 12a of the frame body 12. FIG. 5 shows the joining member, where (a) is a plan view of the joining member and (b) is a cross-sectional view of (a) taken along the line A-A. The joining member 13a is an annular AuSn solder material, and its inner diameter, outer diameter, and thickness are the same as those of the step portion formed on the annular tip surface 12a of the frame body 12. The inner diameter of the annular joining member 13a is approximately 5.8 mm, and the outer diameter is 6 mm. The thickness is approximately 0.2 mm. In this embodiment, the joining member 13a is placed on the outermost step portion. In addition, when the tip outer surface portion is an inclined surface, the joining member 13a is placed on the outermost of the inclined surface.

[Joining step: FIG. 4(d)]
Next, the tray 14 carrying the frame 12, the blocking member 11, and the bonding member 13a is transported to a heating furnace and put into the furnace to melt the bonding member 13a, and then the molten bonding member 13a is cooled and solidified to bond the blocking member 11 and the frame 12. Each member put into the furnace is heated to a temperature equal to or higher than the melting point of the bonding member 13a, for example, in an air atmosphere, a nitrogen atmosphere, or a vacuum atmosphere, and the molten bonding member 13a, which is at the bottom, spreads on the metal film formed on the annular tip surface 12a and the metal film formed on the blocking member 11 while wetting and rising to the step portion in the upward direction. A predetermined amount of the molten bonding member 13a is filled into the gap formed between the inner surface of the recess 12c and the outer circumferential surface of the blocking member 11. The remaining bonding member 13a that is not filled into the gap remains on the surface of the annular tip surface 12a. After that, the molten joining member 13a is cooled and solidified, and the joining member 13a becomes the joining material 13, which joins the blocking member 11 and the frame body 12, thereby obtaining the joined body 10 shown in FIG. 1. The above-mentioned action also works when the tip outer surface portion is an inclined surface. That is, when the joining member 13a placed on the outermost side of the inclined surface melts, the molten joining member 13a wets up the inclined surface and spreads onto the metal film formed on the annular tip surface 12a and the metal film formed on the blocking member 11. A predetermined amount of the molten joining member 13a is filled into the gap formed between the inner surface of the recess 12c and the outer peripheral surface of the blocking member 11. The remaining joining member 13a that is not filled into the gap remains on the surface of the annular tip surface 12a. After that, the molten joining member 13a is cooled and solidified, and the joining member 13a becomes the joining material 13, which joins the blocking member 11 and the frame body 12, thereby obtaining the joined body 10 shown in FIG. 1.

In this process, when the tray 14 carrying the frame 12, the blocking member 11, and the joining member 13a is put into a heating furnace, the joining member 13a shrinks as it is heated. However, in this embodiment, the joining member 13a is placed on the step. In other words, the joining member 13a is placed outside the outer diameter of the blocking member 11 and is placed at a lower position than the main surface of the blocking member 11 that is not in contact with the recess 12c. Therefore, even if the joining member 13a shrinks as a result of heating the joining member 13a, the step formed on the annular tip surface 12a prevents the joining member 13a from climbing up onto the blocking member 11. As a result, it is possible to provide a highly reliable joining body by suppressing the joining position shift of the joining body, insufficient joining strength, and differences in the external shape of the joining material between each joining body when multiple joining bodies are manufactured.

The manufacturing method of the joint body of the present invention has been described above based on the examples, but the scope of the present invention is not limited to the above examples and can be changed arbitrarily within the scope of the technical idea of the present invention. For example, the joint material 13 and the joint member 13a are AuSn solder, but they are not limited to AuSn solder and other brazing materials such as AgSn solder may be used. In addition, as an example of the joint body 10, an example in which the blocking member 11 and the frame body 12 are joined is shown, but the joint body of the present invention is not limited to the joining of the blocking member 11 and the frame body 12 and can be applied to any joint body in which two or more members are joined via a joint material. In addition, in one example of the manufacturing method of the joint body, the tip outer side surface portion formed on the annular tip surface 12a is a step portion, but the tip outer side surface portion may be an inclined surface. Furthermore, the tip outer side surface portion may be composed of a step portion and an inclined surface. In the case where the first component is, for example, a rectangular column, the tip outer side surface portion may be formed so that the dimension in the width direction gradually increases from the tip of the frame body toward the outside. Also, the outer end surface may be inclined from the tip of the frame toward the outside in the width direction. Although an example has been shown in which the joining member placement process and the blocking member mounting process are performed in order, for example, the joining member placement process may be performed after the blocking member mounting process. Although an example has been shown in which the joining member 13a is placed on the outermost step portion, for example, the joining member 13a may be placed on each step portion (two step portions). Also, an example has been shown in which the height between the step portions and the thickness of the joining member 13a are the same, for example, the thickness of the joining member 13a may be made thicker than the height between the step portions.

REFERENCE SIGNS LIST 10: Joint body 11: Closing member 12: Frame body 12a: Annular tip surface 12b: Through hole 12c: Recess 13: Joint material 13a: Joint member

Claims (3)

A manufacturing method of a joined body in which a first component and a second component are joined with a joining material, comprising the steps of:
The first component has a tip outer surface portion formed on a joining surface with the joining material such that a dimension in a width direction from a tip portion of the tip outer surface portion gradually becomes wider toward an outside, and a step of placing a joining member to be the joining material on the tip outer surface portion of the first component;
the first component has a recess at the tip of the joining surface, and the second component is placed on the first component such that the second component is accommodated in the recess of the first component;
and melting the joining material, the molten joining material filling a gap formed between the recess and the second component while wetting the tip outer surface portion , and solidifying to join the first component and the second component. The method for manufacturing a joint body according to claim 1, characterized in that the tip outer surface portion of the first component has at least one step portion. The method for manufacturing a joint body according to claim 1, characterized in that the tip outer surface portion of the first component is an inclined surface.

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