  We investigate the mass spectra of ordinary heavy mesons, based on a
nonrelativistic potential approach. The heavy-light quark potential contains
the Coulomb-type potential arising from one-gluon exchange, the confining
potential, and the instanton-induced nonperturbative local heavy-light quark
potential. All parameters are theoretically constrained and fixed. We carefully
examine the effects from the instanton vacuum. Within the present form of the
local potential from the instanton vacuum, we conclude that the instanton
effects are rather marginal on the charmed mesons.
