Abstract: An image-forming device has an image-carrying unit, a transferring unit, a power-supplying unit, a current-detecting unit, a voltage-detecting unit, a memory unit, and a controller. The power-supplying unit supplies voltage and current to the transferring unit to transfer a toner onto a recording medium. The current-detecting unit detects the current flowing in the transferring unit. The voltage-detecting unit detects the voltage applied to the transferring unit. The memory unit stores a characteristic curve indicating a correlation between an optimal current and at least the detected voltage. The optimal current enables the transferring unit to transfer the toner supported on the image-carrying unit onto the recording medium. The controller controls the power-supplying unit to supply the optimal current to the transferring unit.

Abstract: An optical scanner includes a scanning unit having a reflecting surface that reflects a laser beam and scans the laser beam in a primary scanning direction, a laser beam radiation unit that radiates laser beams to the reflecting surface from directions at predetermined angles to a reference plane, which is orthogonal to the reflecting surface and extending along the primary scanning direction, and optical members provided on optical paths of the laser beams after reflections. The laser beam radiation unit radiates the laser beams, in such a manner that, an angle on a plane orthogonal to the reference plane between a first and second optical paths is larger than an angle between the first and third optical paths, the second and third optical paths being adjacent to one side and other side of the first optical path, respectively. The optical member on the second optical path is nearer the reflecting surface than the third optical path.

Abstract: A tape printer capable of performing multicolor printing and permitting an already printed tape to be rewound for printing two line character trains, bold printing and adding ornamental frames beside the first printed character train. The tape printer installs therein a tape cassette in which is housed a print tape and an ink ribbon formed with different colored ink portions at a set pitch in the lengthwise direction of the print tape. An ink ribbon take up mechanism is provided for taking up ink ribbon that passes between a platen and a print element provided external to the cassette. Tape transport mechanism is provided for transporting the print tape. The tape printer is constructed so that ink ribbon and the print tape are transportable in a forward direction for printing, and the ribbon take up mechanism stops and the platen is movable away from the printing section when the tape transport mechanism reversely transports the print tape.