US 5,569,158 A · Shielding structure of electronic endoscope apparatus

Abstract

A shielding structure of an electronic endoscope apparatus which can sufficiently remove noise even when an electric cautery is used. A signal transmission cable which connects a charge coupled device disposed at the end portion of an electronic endoscope to a processor unit is electrically shielded by a double shield composed by an inner shield and an outer shield. The inner shield is connected to the ground in a light source connector and the outer shield is connected to the frame ground of the processor unit through a capacitor. The outer shield is further connected to a shielding member provided around the charge coupled device and a patient ground to which an electrode piece of an electric cautery is connected. Noise is greatly removed, so that the picture quality is improved.

Claims5

Dependent claims

An electronic endoscope apparatus comprising:

a signal transmission cable;
a charge coupled device disposed at an end portion of the electronic endoscope signal transmission cable having an outer periphery;
a processor unit having a circuit ground and a frame ground;
an inner shield which is provided directly around said outer periphery of said signal transmission cable and which is constituted by wound shielded wire and connected to said ground in the processor unit;
said inner shield having an insulator formed on the outside thereof;
an outer shield formed outside of said inner shield insulator and connected to said frame ground of said processor unit;
and
a medical instrument insertion channel located outside of said outer shield.

5 more elements

Dependencies are inferred from the claim text.

Shielding structure of electronic endoscope apparatus

Life of this patent

Shielding structure of electronic endoscope apparatus

Life of this patent

Abstract

Claims5