BRIEF DESCRIPTION OF THE DRAWINGS
The invention, together with objects and advantages thereof, may best be understood by reference to the following description of the presently preferred embodiments together with the accompanying drawings in which:
FIG. 1A is a cross-sectional view of a portable device according to a first embodiment of the present invention;
FIG. 1B is a schematic perspective view showing the portable device of FIG. 1A;
FIG. 2 is a schematic diagram showing a laser welding device;
FIG. 3 is a bottom view showing a laser light path in a state in which a cover is removed from a case of the portable device;
FIG. 4 is an enlarged cross-sectional view showing a flange of a first case part in a state joined with an open end surface of a second case part;
FIG. 5 is a perspective view showing welded portions of the first case part and the second case part;
FIG. 6A is an enlarged perspective view showing a flange in a second embodiment of the present invention;
FIG. 6B is a side view showing the flange of FIG. 6B;
FIG. 7 is an enlarged cross-sectional view showing a flange of a first case part in a state joined with an open end surface of a second case part in another embodiment of the present invention;
FIGS. 8A and 8B are enlarged cross-sectional views each showing a flange of a first case part in a state joined with an open end surface of a second case part in a further embodiment of the present invention;
FIGS. 9A and 9B are side views showing cases in still further embodiments of the present invention:
FIGS. 10A and 10B are schematic diagrams showing laser light emissions in other embodiments of the present invention; and
FIGS. 11A to 11D are cross-sectional views each showing joined portions of two resin parts in further embodiments of the present invention.