An objective optical system for endoscopes is characterized by comprising, in order from its object side, a stop, a first lens and a second lens. The control unit moves the compliance center of the shaft along a predetermined groping route in a state where the pressing force acting in the direction parallel to the z-axis is produced by the end effector. The printers 2 generate processing information when the user processes the image data, and store the processing information in the IC card 6. The digital value that is supplied to the ith DA converter for the purpose of DA conversion corresponds to the ab most significant bits in the sum of the digital value that will be converted by the apparatus and to i1. The cart then can be moved to the particular locations for the voting procedure. A first potting compound that is deformable andor has a relatively high thermal conductivity holds the temperature-responsive device in the cavity and a second potting compound having a relatively low thermal conductivity may be in the cavity behind the first potting compound.