Abstract: An electronic endoscope apparatus includes an electronic endoscope including an insertion portion, an operation portion, and a universal cord; a plurality of types of signal cables which are selectively placed between the insertion portion and a connection connector of the universal cord, have equal lengths and different diameters, and include overall shields having surface areas corresponding to the diameters; and an electromagnetic covering member which is configured to have a predetermined surface area and covers a small-diameter signal cable to form a shield reinforcing portion, the shield reinforcing portion electrically connected to the overall shield of the small-diameter signal cable causing a sum of the surface area of the shield reinforcing portion and the surface area of the overall shield of the small-diameter signal cable to be set to be equal to or larger than the surface area of the overall shield of a large-diameter signal cable.

Abstract: An electronic endoscope apparatus includes an electronic endoscope including an insertion portion, an operation portion, and a universal cord; a plurality of types of signal cables which are selectively placed between the insertion portion and a connection connector of the universal cord, have equal lengths and different diameters, and include overall shields having surface areas corresponding to the diameters; and an electromagnetic covering member which is configured to have a predetermined surface area and covers a small-diameter signal cable to form a shield reinforcing portion, the shield reinforcing portion electrically connected to the overall shield of the small-diameter signal cable causing a sum of the surface area of the shield reinforcing portion and the surface area of the overall shield of the small-diameter signal cable to be set to be equal to or larger than the surface area of the overall shield of a large-diameter signal cable.

Abstract: In a cross type oscillator (20) comprising spiral inductors (L1, L2) and resonance capacitors (C1, C2) which decide resonance frequencies, transistors (Q1, Q2) which generate negative resistance by base-collector connection with the common emitter, and a current source (I1) which decides a circuit current value, a double-wave output is extracted from the emitter terminals of the transistors (Q1, Q2).

Abstract: An endoscopic apparatus comprising a solid-state image pickup device installed in an insert assembly, a signal transmission member for conducting the electric signal into which the solid-state image pickup device photoelectrically converts an optical image, and a flexible tube-like metal member that makes up part of the cover of the insert assembly and/or a flexible tube-like metal member that constitutes part of the universal cord, whereby the signal transmission member is inserted through the insert assembly member and the universal cord, the shield member that covers the signal transmission member is disposed at least in part of the insert assembly and/or part of the universal cord assembly, and the shield member and the metal members are set to be equipotential to each other.