Techniques for efficient searching in asynchronous systems, such as W-CDMA, as well as multi-mode searching, are disclosed. The bolt includes a cam pin receptacle and a cam pin carried by the bolt. The plug portion, or plug, is integrally molded with a longitudinal section of the male fitting member. The remaining cone has a high density row of teeth, which is located closer to the axis of rotation of the bit than the farther intermediate row and farther from the axis of rotation of the bit than the closer intermediate row. The thickness detecting unit detects a thickness of the photosensitive layer on a basis of a value of a current supplied to the charging device.