Ever since the world's first laser printer1) was introduced in 1975, the standard for scanning optics systems has been the fθ lens (FTL), however fθ mirror (FTM) systems have also been under consideration since roughly the same date. In 1977 a theoretical analysis of parabolic FTM was made2), and they were put to practical use in large-format printers. Since then, many papers and patents concerning FTM have been published 3). In October of 1990, a letter-size laser printer that used an FTM went on sale, and a related technical paper was released4), but FTL systems nonetheless remained the main choice for scanning optics. In the course of developing plastic FTL, we found out the usefulness of FTM, in particular on the advantages that come with making them out of plastic, and studied some FTM systems. As a result, we have arrived at an original structure built by combining rotationally symmetric aspherical FTM with an ABTL (aspherical barrel-shaped toroidal lens), that is applicable to high-resolutions of 600 dpi and above.