The ornamental design for an earphone, as shown and described.
FIG. 1 is a perspective view of an earphone embodying our design;
FIG. 2 is a side view of the earphone shown in FIG. 1;
FIG. 3 is an opposite side view of the earphone shown in FIG. 2;
FIG. 4 is top view of the earphone shown in FIG. 1;
FIG. 5 is a bottom view of the earphone shown in FIG. 1;
FIG. 6 is a rear view of the earphone shown in FIG. 1; and,
FIG. 7 is a front view of the earphone shown in FIG. 1.
The broken-line disclosure in the views is understood to represent portions of the article in which the claimed design is embodied, but which form no part of the claimed design. Where a broken-line abuts a claimed surface, that broken line is understood to represent an unclaimed boundary between claimed and unclaimed surfaces.