  Imaging observations of faint meteors were carried out on April 11 and 14,
2016 with a wide-field CMOS mosaic camera, Tomo-e PM, mounted on the 105-cm
Schmidt telescope at Kiso Observatory, the University of Tokyo. Tomo-e PM,
which is a prototype model of Tomo-e Gozen, can monitor a sky of
${\sim}1.98\,\mathrm{deg^2}$ at 2\,Hz. The numbers of detected meteors are 1514
and 706 on April 11 and 14, respectively. The detected meteors are attributed
to sporadic meteors. Their absolute magnitudes range from $+4$ to
$+10\,\mathrm{mag}$ in the $V$-band, corresponding to about
$8.3{\times}10^{-2}$ to $3.3{\times}10^{-4}\,\mathrm{g}$ in mass. The present
magnitude distributions we obtained are well explained by a single power-law
luminosity function with a slope parameter $r = 3.1{\pm}0.4$ and a meteor rate
$\log_{10}N_0 = -5.5{\pm}0.5$. The results demonstrate a high performance of
telescopic observations with a wide-field video camera to constrain the
luminosity function of faint meteors. The performance of Tomo-e Gozen is about
two times higher than that of Tomo-e PM. A survey with Tomo-e Gozen will
provide a more robust measurement of the luminosity function.
