The ornamental design for a microprojector, as shown and described.
FIG. 1 is a perspective view of a micro projector showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is a perspective view showing the micro projector in an using state; and,
FIG. 9 is a perspective view showing the micro projector in an using state, with a height adjuster applied to adjust the height of the micro projector.