Abstract: An optical fiber code holding structure, includes: an optical adapter and an optical fiber code holding member. An optical connector of an optical fiber is connected to an optical adapter. The optical connector is attached to an end of an optical fiber code of the optical fiber. The optical fiber code holding member has a light shielding device shielding lights emitted from the optical adapter and a holding device holding the optical fiber code.

Abstract: An electric system has exothermic components housed in a case; the case is formed with ventilation holes, and a fan forcibly evacuates the hot air from the inner space through the ventilation holes for removing heat from the exothermic components; foamable pain is spread on the surface near the ventilation hole, and a fuse element is exposed to the air passage; when a fire breaks out inside the case, the paint foams for closing the ventilation hole, and the fuse element stops the fans, whereby the fire is extinguished without being spread to the outside the case.

Abstract: An optical fiber code holding structure, includes: an optical adapter and an optical fiber code holding member. An optical connector of an optical fiber is connected to an optical adapter. The optical connector is attached to an end of an optical fiber code of the optical fiber. The optical fiber code holding member has a light shielding device shielding lights emitted from the optical adapter and a holding device holding the optical fiber code.

Abstract: An electric system has exothermic components housed in a case; the case is formed with ventilation holes, and a fan forcibly evacuates the hot air from the inner space through the ventilation holes for removing heat from the exothermic components; foamable pain is spread on the surface near the ventilation hole, and a fuse element is exposed to the air passage; when a fire breaks out inside the case, the paint foams for closing the ventilation hole, and the fuse element stops the fans, whereby the fire is extinguished without being spread to the outside the case.

Abstract: A thermal printer apparatus has a configuration which avoids adverse influences caused by a voltage variation and a change in printing speed so that superior printing quality is obtained. A temperature of a thermal head is measured based on an output signal of a thermistor contained in the thermal head, and a voltage applied to the thermal head is measured by a thermal head voltage detecting circuit. A CPU calculates a maximum energizing pulse width based upon the measured temperature and head-applied voltage, a main pulse width based on the maximum energizing pulse width and a printing speed, and a preselected ratio of a sub-pulse width with respect to the maximum energizing pulse width in response to a drive history. The CPU supplies the energizing pulse to the thermal head and the energizing pulse has a width set as the smaller of the sum of the pulse widths of the main pulse and the sub-pulse, and the maximum energizing pulse width.