| 摘要 |
PROBLEM TO BE SOLVED: To provide a grooved frame, of which the half in the upper side of a lens, is made into a half rim and the half in the opposite side holds the lens with a level string and which prevents chips and cracks of the outside peripheral edge of the lens. SOLUTION: Both ends of protections 6, formed C-shaped are fixed to half rims 1 with screws, and the protections 6 are arranged along the outside peripheries of lenses 3.
|
