Magnetic accessory attachment aid for spectacles

摘要

To enable extra lenses (30,32) to be secured to a pair of spectacles in front of the normal lenses (18,20) a magnetic connection (22) can be incorporated in the frame (2) e.g. in the bridge piece (16). One magnet (36) is housed inside a bridge piece connecting the extra lenses (e.g. for sunglasses) and the other magnet (34) is in the main bridge piece. Permanent magnets having high characteristic values such as energy density and permanence are incorporated, using alloys contg. at least one rare earth element and/or cobalt and/or by making them magnetically anisotropic. Their volume and weight are low enough for incorporating in the frame.