The ornamental design for an earphone, as shown and described.
FIG. 1 is a skewed isometric view of an earphone from one perspective, showing one embodiment of our new design for the left ear.
FIG. 2 is a skewed isometric view thereof from another perspective.
FIG. 3 is a left side elevational view thereof.
FIG. 4 is a right side elevational view thereof.
FIG. 5 is a front elevational view thereof.
FIG. 6 is a rear elevational view thereof.
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
Another embodiment for the right ear is provided, which is a mirror image of the embodiment for the left ear shown in FIGS. 1 through 8.
Stippling and tangency lines in the drawings represent the three-dimensional contours of the design, and are not intended to indicate surface decoration. The broken lines in the drawings depict portions of the earphone that form no part of the claimed design.