Resin joined body and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-9809014-B2
Application number	US-201214238412-A
Country	US
Kind code	B2
Filing date	Sep 27, 2012
Priority date	Sep 29, 2011
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

A method for producing a resin joined body in which a specific region L 1 of a welding portion of a second resin member ( 21 ) is provided to form a low-laser-light-transmissible portion, and the low-laser-light-transmissible portion has a laser light transmissibility lower than that of a region of the welding portion other than the specific region L 1 . Welding is carried out so that a portion between points S 2 and F 2 , serving as a weld overlap portion ( 112 ), is present in the specific region L 1 forming the low-laser-light-transmissible portion. Also disclosed is a resin joined body.

First claim

The invention claimed is:

1. A method for producing a resin joined body, the method comprising bringing a first resin member having laser light absorbability into contact with a second resin member having laser light transmissibility; and irradiating the second resin member with laser light, so as to carry out a cycle of welding along a line to form a welded portion of a resin joined body; and
wherein an end point of the cycle of welding lies beyond the start point of the cycle of welding, wherein the welded portion has a weld overlap portion, wherein the weld overlap portion is formed by welding occurring twice along the weld line between the start point of the cycle of welding and the end point of the cycle of welding, the method for producing the resin joined body characterized in that:
prior to irradiating the second resin member with laser light, so as to carry out the cycle of welding, a specific region of the welding portion of the second resin member is formed as a low-laser-light-transmissible portion, the low-laser-light-transmissible portion having laser light transmissibility lower than that of a region of the welding portion other than the specific region; and
the first resin member and the second resin member are welded together so that the weld overlap portion overlaps at least a portion of the specific region forming the low-laser-light-transmissible portion.

2. The method for producing the resin joined body according to claim 1 , wherein the first resin member and the second resin member are welded together so that the weld overlap portion is present almost entirely within the specific region forming the low-laser-light-transmissible portion.

3. The method for producing the resin joined body according to claim 1 , wherein the second resin member contains reinforcing fiber and is formed through injection molding.

4. The method for producing the resin joined body according to claim 1 , wherein the specific region forming the low-laser-light-transmissible portion of the second resin member is formed so as to be thicker in a direction toward a laser-light incident surface of the second resin member than a thickness of a region of the welding portion other than the specific region, and to protrude on the laser light incident surface.

5. The method for producing the resin joined body according to claim 1 , wherein the specific region forming the low-laser-light-transmissible portion of the second resin member has a laser light incident surface which is rougher than that of a surface of the welding portion other than the specific region.

6. The method for producing the resin joined body according to claim 1 , wherein the second resin member has an externally visible positioning mark which is employed when the second resin member is brought into contact with and positioned against the first resin member.

7. A resin joined body produced by bringing a first resin member having laser light absorbability into contact with a second resin member having laser light transmissibility, and irradiating the second resin member with laser light, so as to carry out a cycle of welding along a line to form a welded portion of a resin joined body,
wherein an end point of the cycle of welding lies beyond the start point of the cycle of welding, wherein the welded portion has a weld overlap portion, wherein the weld overlap portion is formed by welding occurring twice along the weld line between the start point of the cycle of welding and the end point of the cycle of welding, the resin joined body characterized in that:
prior to irradiating the second resin member with laser light, so as to carry out the cycle of welding, a specific region of a welding portion of the second resin member is formed as a low-laser-light-transmissible portion, the low-laser-light-transmissible portion having laser light transmissibility lower than that of a region of the welding portion other than the specific region; and the weld overlap portion is present in the specific region forming the low-laser-light-transmissible portion.

Assignees

• Ngk Spark Plug Co

Inventors

• Kawagishi Wataru
• Fuji Yusuke
• Koda Takashi
• Kohmura Yoshihiko

Classifications

• B29C66/7212

  characterised by the composition of the fibres · CPC title

• B29C65/1696

  making use of masks · CPC title

• B29C66/112

  Single lapped joints · CPC title

• B29C66/836

  Moving relative to and tangentially to the parts to be joined, e.g. transversely to the displacement of the parts to be joined, e.g. using a X-Y table (B29C66/65 takes precedence) · CPC title

• B29C65/1654

  scanning at least one of the parts to be joined · CPC title