Stand magnifier and lens

Details Stand magnifier and lens Stand magnifier and lens

1988-01-28

1990-07-31

Arnold, Bruce Y.

350247, 350432, G02B 2500, G02B 302

Patent

active

049445740

ABSTRACT:
The invention discloses a bi-convex lens having aspheric surfaces, each of substantially identical curvature. The lens may be used in a stand magnifier which comprises a stand adapted to be supported on a surface and to which is attached or attachable such a magnifying lens. At least part of the stand and the lens is tiltable with respect to the surface in either direction from a position where the lens is parallel to the surface, preferably through an angle of up to 20.degree..

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patent: 3428286 (1969-02-01), Del Pesco
patent: 3628871 (1971-12-01), Himmelstrup
patent: 4348081 (1982-09-01), Betensky
patent: 4606607 (1986-08-01), Kurihara
patent: 4641929 (1987-02-01), Braat

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