  A relativistic quark model of mesons formulated within the formalism of
Fokker-type action integrals is proposed, in which an interquark interaction is
mediated by scalar-vector superposition of higher derivative fields. In the
non-relativistic limit the model describes a two-particle system with the
linear potential. In order to analyze the model in the essentially relativistic
domain the perturbed circular orbit approximation and certain principle of
selection of physically meaningful solutions are applied which permit one to
perform the canonical quantization of the model. It is shown that the model
reproduces well specific features of the light meson spectroscopy.
