| 摘要 |
PROBLEM TO BE SOLVED: To prevent visibility from being obstructed by supporting the mask by a lower jaw, and at the same time, prevent a hair style from being disturbed, and in addition, make mouth board to open. SOLUTION: A mask body 20 is equipped with a mask body cover 40, a nozzle 50 through which a respiration gas flows, and a flexible seal member which closely joins to the face of a wearer 11. At the lower section of the mask body cover 40, a fixing piece 70 which comes into contact with the lower jaw of the wearer 11 and supports the mask body cover 40, is formed. On both sides of the mask body cover 40, an attaching piece 46 to attach a supporting band 30 is formed. The supporting band 30 is attached to respective attaching pieces 46 and two locations on the fixing piece 70 so that the mask body 20 may be supported from four directions. On the nozzle 50, a circular leak hole 53 which expands in the discharging direction of the expiration gas is formed. For the mask body 20, a space volume is set at 50 to 100 cm3.
|
