Abstract: In a scroll compressor of the present invention, a fixed scroll 11 and an orbiting scroll 12 are meshed with each other such that spiral laps of the fixed scroll 11 and the orbiting scroll 12 inwardly face each other, an Oldham ring 26 is provided between the main bearing member 19 and the orbiting scroll 12, and a key portion of the Oldham ring 26 is inserted into a key groove 19a of the main bearing member 19. Grooves 19b are formed in Oldham ring 26 sliding surfaces on both sides of the key groove 19a. According to this configuration, the Oldham ring 26 and the main bearing member 19 can be restrained from coming into contact with each other in the vicinity of the bearing key groove 19a, and restrained from vibrating, and it is possible to provide an inexpensive scroll compressor of low noise.

Abstract: A nonvolatile semiconductor memory device capable of being changed in method of use according to its application and in addition having a high reliability and an IC memory card using the same. An IC memory card is provided with multi-level type flash memory chips and a controller as principal constituent elements and constituted so as to allow free selection of plurality of operation modes according to the application, that is, use where a storage capacity is large, but there is a reduction in the write/erase speed or the guaranteed number of the repeated rewrites or use where the storage capacity is small, but there is no reduction in the write/erase speed or the guaranteed number of the repeated rewrites.