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 right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a top plan view thereof.
The broken lines shown in the figures are included for the purpose of illustrating portions of the micro projector and form no part of the claimed design.