A device for reading andor writing a record carrier, the device comprising converging means for focusing a radiation beam originating from a radiation source on the record carrier. In one example, the method involves making it difficult to extract inner information inside an integrated circuit chip via analyzing variations of power consumption of the IC chip. The invention also provides for agonists, antibodies, or antagonists specifically binding HREVP, and their use, in the prevention and treatment of diseases associated with expression of HREVP. Thus, even the electron beam, which is generated from the location apart from the center axis of the electron gun unit, can be guided to the radio-frequency interaction unit in the same manner as in the location at the canter axis of the electron gun unit. The clutching arms are mounted on the main body by the fixing plates thereof fixed on two opposite sides of the main body. The module for estimating signal direction of arrival of the present invention effectively reduces wrong estimation of the signal direction of arrival caused by loss of rank.