| 摘要 |
PURPOSE:To develop a toner adhered quantity measuring instrument for a transfer type color printer capable of accurately measuring the adhered quantity of toner for color adhering to a photosensitive drum. CONSTITUTION:This instrument is constituted of a light projecting means (a light source 52 and a polarizing filter 53) projecting single polarized light to the toner 51 adhered to the photosensitive drum 50, a 2st light receiving means (a light receiving element 54 and a polarizing filter 55) selectively receiving the same polarized light as that of the light projecting means out of the light reflected by projecting the light to the toner 51, a 2nd light receiving means (a light receiving element 56 and a polarizing filter 57) selectively receiving the polarized light different from that of the light projecting means out of the light reflected by projecting the light to the toner 51, and a signal processing circuit 58 outputting measurement information by multiplying the received light output from the 2nd light receiving means by a fixed coefficient and subtracting a value obtained by multiplying the fixed coefficient from the received light output from the 1st light receiving means. |
