| 摘要 |
PROBLEM TO BE SOLVED: To carry a spare sunglass lens without any bulkiness. SOLUTION: Blind holes (11, 11a) are bored, from the backside, near both right and left edges of right and left correction lenses (10, 10), respectively, which are first lenses supported by spectacle frames (20, 20). A magnet (12) is buried in each hole. Two second lenses (14, 14) similar in shape to the left and the right lenses are prepared. Near both right and left edges thereof, blind holes (15, 15a) are bored in places matching the blind holes of the first lenses from the backside. A magnet (12a) is buried in each hole. The two second lenses are attachable to/detachable from the first lenses. COPYRIGHT: (C)2011,JPO&INPIT
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