US Patent 7087012 Endoscope hood

At least one concave portion 40 is provided as a part of a protrusion 38 of an end portion of a hood body 37a while protruding frontward from the location of a front-end lens surface 34 with a protrusion length shorter than those of the parts other than the concave portion, an inclined surface 44 divergent frontward from the location of the front-end lens surface 34 is provided on the inside surface of at least one of the concave portions 40, and the angle β between the inside inclined surface 44b of the concave portion 40 and the front-end lens surface 34 is larger than the angle α between the inside surfaces of the other parts adjacent to the concave portion 40 and the front-end lens surface 34.