| 摘要 |
<p>A recording medium cartridge in which the quality of external view can be prevented from deteriorating by protecting a writing print layer against damage at the time of ultrasonic welding. The ink layer (20) is obtained by adding a writing filler (21) and resin particles (22) having a mean particle size not smaller than that of the writing filler (21) into ink (23). The resin particles (22) abut against a welding horn (9) to prevent the writing filler (21) from being dropped off or deformed through ultrasonic vibration.</p> |
