Patent ID: 8721531
Filing Date: 2014-05-13
Classification: A61B,G02B

Abstract:
1. An electronic endoscope comprising: a distal end portion of an insertion portion which incorporates an image pickup unit; a first metal frame which holds an observation window provided in front of the image pickup unit; a second metal frame which holds an objective optical system of the image pickup unit; a third metal frame which is made to fit with a rear portion of the second metal frame and holds an electronic component of the image pickup unit; an anti-fogging unit which prevents fogging of the observation window; and a non-metal thermal insulation member which thermally insulates the anti-fogging unit and the second metal frame from each other to inhibit transmission of heat generated in the anti-fogging unit to the third metal frame, an outer circumferential face of which fits with an inner circumferential face of the first metal frame, and an inner circumferential face of which fits with an outer circumferential face of the second metal frame, wherein a groove portion, in which a flexible printed board of the anti-fogging unit is arranged, is formed in an outer circumferential portion of the thermal insulation member, and the flexible printed board is fastened to the groove portion with adhesive for damp proofing.