An electromagnetically actuated adjusting apparatus for lens is disclosed. Then, the direct current component of the FPD signal obtained by photoelectric conversion of part of the laser beam by means of another photo detector and the first TIA is cut out by a high pass filter and then subtracted by a subtracter. Each of the fed antenna elements is arranged astride at least two of the parasitic antenna elements. A plurality of linking members 32 each pivotable with respect to the body normally retain the force output member in the initial position, but upon movement of the input member to the activated position release the force output member in response to the disk springs. , objects, in relation to and within pluralities of records.