| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a visual field securing device allowing a long-time observation. <P>SOLUTION: This visual field securing device 1 is mounted on an insertion part 8 of an endoscope 6 having an objective lens. This visual field securing device 1 is provided with a first cover 24a covering the objective lens, having a transparent part for covering the objective lens and exposed to the outside; and a second cover 24b covering the objective lens, having a transparent part for covering the objective lens and exposed to the outside by being changed over from the first cover 24a. This visual filed securing device 1 is further provided with a changeover means 26a retreating the first cover 24a from a position of covering the objective lens and arbitrarily changing over between the first cover 24a and the second cover 24b by an external operation. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
