Abstract: An electromagnetic screen (1) comprises a plurality of antennas (4) each of which reflects an electromagnetic wave having a specific frequency. The plurality of antennas (4) are arranged so as to constitute a pattern. Each of the antennas (4) has three segment-shaped first element parts (4a) and three segment-shaped second element parts (4b). The three first element parts (4a) radially extend from the center of the antenna (4) by substantially the same length such that any two of the three first element parts (4a) form an angle of 120° with each other. Each of the second element parts (4b) are connected to an outer edge of a corresponding one of the first element parts (4a).

Abstract: On one side of a passageway for an identification subject 10 with an IC tag 7 to pass, an antenna is provided for reading information stored in the IC tag 7, and a front wave-absorbing wall 2 and a rear wave-absorbing wall 3 are provided protruding from the vicinity of the front and rear edges of the antenna 8 toward the passageway 13 such that the walls narrow the half-power angle ? of the radio wave radiated from the antenna 8 over a horizontal plane. A wave-absorbing side wall 1 is also provided on the other side of the passageway 13. With such a structure, the propagation area of the radio wave can be controlled so that the reading area of the IC tag 7 can be limited, and the influence of the reflected wave is suppressed.

Abstract: An electromagnetic screen (1) comprises a plurality of antennas (4) each of which reflects an electromagnetic wave having a specific frequency. The plurality of antennas (4) are arranged so as to constitute a pattern. Each of the antennas (4) has three segment-shaped first element parts (4a) and three segment-shaped second element parts (4b). The three first element parts (4a) radially extend from the center of the antenna (4) by substantially the same length such that any two of the three first element parts (4a) form an angle of 120° with each other. Each of the second element parts (4b) are connected to an outer edge of a corresponding one of the first element parts (4a).

Abstract: A bending mechanism for use with a stereoscope, comprises a tubular body or linear body having a bending part, a movable part which can move in the lengthwise direction of the tubular body or linear body, two actuators formed to act in opposition to each other via the movable part, and a pull wire which extends in the lengthwise direction along the bending part. One end of the wire is fixed to one end side of the bending part and the other end of the wire is fixed to the movable part set at the other end side of the bending part. At least one of the two actuators is a shape memory element. The bending mechanism of the present invention is free from displacement of the movable part when bending action is not needed, since the two actuators are used which act in opposition to each other via the movable part, and thus, buckling of the bending part can be prevented. The simple structure of the activator unit of the present invention facilitates a reduction of the size of the structure.