Method for producing resin part

Patent metadata

Field	Value
Publication number	US-12319007-B2
Application number	US-202318343299-A
Country	US
Kind code	B2
Filing date	Jun 28, 2023
Priority date	Jun 30, 2022
Publication date	Jun 3, 2025
Grant date	Jun 3, 2025

Abstract

A method for producing a resin part includes: preparing an intermediate body comprising a first member and a second member, the first member containing a resin; and welding the first member with the second member by performing scanning of the intermediate body with a first laser beam and a second laser beam. In the welding of the first member with the second member, the scanning with the first laser beam and the second laser beam is performed in a state in which a center of a second spot is located on a rear side in a direction of the scanning with the first laser beam and the second laser beam as compared to a center of a first spot while at least a part of the first spot and at least a part of the second spot overlap with each other.

First claim

The invention claimed is:

1. A method for producing a resin part, the method comprising:
preparing an intermediate body comprising a first member and a second member, the first member containing a resin; and
welding the first member with the second member by performing scanning of the intermediate body with a first laser beam and a second laser beam, wherein:
when a first spot is defined as a spot of the first laser beam on a front surface of the intermediate body and a second spot is defined as a spot of the second laser beam on the front surface of the intermediate body:
in the welding of the first member with the second member, the scanning with the first laser beam and the second laser beam is performed in a state in which a center of the second spot is located on a rear side in a direction of the scanning with the first laser beam and the second laser beam as compared to a center of the first spot while at least a part of the first spot and at least a part of the second spot overlap with each other, and
at least one of the first spot and the second spot has a maximum length in a direction parallel to the direction of the scanning longer than a maximum length in a direction perpendicular to the direction of the scanning.

2. The method according to claim 1 , wherein:
a maximum length of the second spot in the direction parallel to the direction of the scanning is longer than a maximum length of the second spot in the direction perpendicular to the direction of the scanning.

3. The method according to claim 2 , wherein:
a maximum length of the second spot in the direction parallel to the direction of the scanning is longer than a maximum length of the first spot in the direction parallel to the direction of the scanning.

4. The method according to claim 3 , wherein:
a power density of the first laser beam at the first spot and a power density of the second laser beam at the second spot are each 0.45 kW/cm 2 or more.

5. The method according to claim 4 , wherein:
a ratio of an area of a region where the first spot and the second spot overlap with each other with respect to an area of the first spot is 65% or less.

6. The method according to claim 5 , wherein:
the area of the region where the first spot and the second spot overlap with each other is 72×10 3 μm 2 or less.

7. The method according to claim 5 , wherein:
the power density of the second laser beam at the second spot is 1.2 times or more than the power density of the first laser beam at the first spot.

8. The method according to claim 3 , wherein:
in the welding of the first member with the second member, the scanning with the first laser beam and the second laser beam is performed in such a way that a region of the first spot that does not overlap with the second spot, a region of the first spot that overlaps with the second spot, and a region of the second spot that does not overlap with the first spot move on a welding planned line of the intermediate body, the welding planned line being parallel to the direction of the scanning.

9. The method according to claim 8 , wherein:
a line connecting the center of the first spot with the center of the second spot intersects the welding planned line.

10. The method according to claim 9 , wherein:
an acute angle of angles formed by the welding planned line and the line connecting the center of the first spot with the center of the second spot is more than 0° and 45° or less.

11. The method according to claim 3 , wherein:
the direction of the scanning is identical with a direction from the center of the second spot to the center of the first spot.

12. The method according to claim 1 , wherein:
a peak wavelength of the first laser beam is shorter than a peak wavelength of the second laser beam.

13. The method according to claim 12 , wherein:
a power density of the first laser beam at the first spot and a power density of the second laser beam at the second spot are each 0.45 kW/cm 2 or more.

14. The method according to claim 13 , wherein:
a ratio of an area of a region where the first spot and the second spot overlap with each other with respect to an area of the first spot is 65% or less.

15. The method according to claim 12 , wherein:
the peak wavelength of the first laser beam is 350 nm or more and 400 nm or less; and
the peak wavelength of the second laser beam is 400 nm or more and 460 nm or less.

16. The method according to claim 1 , wherein:
a power density of the first laser beam at the first spot and a power density of the second laser beam at the second spot are each 0.45 kW/cm 2 or more.

17. The method according to claim 16 , wherein:
a ratio of an area of a region where the first spot and the second spot overlap with each other with respect to an area of the first spot is 65% or less.

18. The method according to claim 17 , wherein:
the area of the region where the first spot and the second spot overlap with each other is 72×10 3 μm 2 or less.

19. The method according to claim 17 , wherein:
the power density of the second laser beam at the second spot is 1.2 times or more than the power density of the first laser beam at the first spot.

20. The method according to claim 1 , wherein:
a peak wavelength of the first laser beam and a peak wavelength of the second laser beam are different from each other.

Assignees

• Nichia Corp
• Laser Systems Inc

Inventors

• Taoka Ryota
• Takao Ryota
• Yamamoto Minoru
• Tamemoto Hiroaki
• Yaguchi Hiroshi

Classifications

• B29C65/1638

  focusing the laser beam on the interface · CPC title

• B23K26/082

  Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head · CPC title

• B23K26/324

  involving non-metallic parts · CPC title

• B29C66/919

  characterised by specific temperature, heat or thermal flux values or ranges (specific electrical resistance values B29C66/81262) · CPC title

• B29C65/1606

  Ultraviolet [UV] radiation, e.g. by ultraviolet excimer lasers · CPC title