Electromagnetically actuated adjusting apparatus for lens

Details Electromagnetically actuated adjusting apparatus for lens Electromagnetically actuated adjusting apparatus for lens

2005-06-29

2008-10-21

Perkey, W. B. (Department: 2862)

Photography

With exposure objective focusing means, focusing aid, or...

C310S012060, C310S015000, C310S020000, C310S022000, C310S036000, C310S037000, C310S154020, C310S154030, C310S154270, C310S156120, C310S156350, C335S038000, C335S202000

Reexamination Certificate

active

07440689

ABSTRACT:
An electromagnetically actuated adjusting apparatus for lens is disclosed. The adjusting apparatus comprises a body capable of furnishing a lens inside, at least one permanent magnet, a first magnetic conductor and a second magnetic conductor. The first and the second magnetic conductors are respectively wound with a plurality of coils. The permanent magnet is adjoined to the body and has a first polarity and a second polarity opposing each other. The first magnetic conductor has at least a first extension member provided opposite to the first polarity. The second magnetic conductor has at least a second extension member provided opposite to the second polarity. The first extension member and the second extension member can better converge magnetic flux lines emanating from the coils when charged to the positions nearing the two polarities of the permanent magnet so high-efficiency focusing and zooming of lens can be achieved.

REFERENCES:
patent: 3339419 (1967-09-01), Wilcox
patent: 4466725 (1984-08-01), Hirohata
patent: 4554610 (1985-11-01), Metz et al.
patent: 5384506 (1995-01-01), Aoshima
patent: 5388086 (1995-02-01), Yamasaki et al.
patent: 6157103 (2000-12-01), Ohta et al.

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