We study some properties of a half-lightlike submanifold M , of a semi-Riemannian manifold, whose shape operator is conformal to the shape operator of its screen distribution. We show that any screen distribution S ( T M ) of M is integrable and the geometry of M has a close relation with the nondegenerate geometry of a leaf of S ( T M ) . We prove some results on symmetric induced Ricci tensor and null sectional curvature of this class.