Lens driving device

Details Lens driving device Lens driving device

2011-05-17

2011-05-17

Hasan, Mohammed (Department: 2873)

Optical: systems and elements

Lens

With support

C359S822000, C359S814000

Reexamination Certificate

active

07944636

ABSTRACT:
In the present invention, a lens driving device has appropriate offset for miniaturization, excellent linearity of driving current versus displacement, and good displacement sensitivity. A casing holding a yoke with at least one permanent magnet mounted on an inner circumference thereof is connected with a lens holder having a driving coil installed on an outer sidewall thereof between an upper spring member and a lower spring member. When the driving coil is not powered, the lens holder props against the casing at a side opposite to an imaged object. When the lens holder props against the casing, the position of the driving coil along Z axis causing a magnitude of driving magnetic field intersecting with the driving coil is 50%˜90% of a maximum value of the driving magnetic field intersecting with the driving coil while the lens holder moves toward the imaged object.

REFERENCES:
patent: 7054078 (2006-05-01), Fujita
patent: 7221526 (2007-05-01), Manabe
patent: 7652835 (2010-01-01), Wang et al.
patent: 2004-280031 (2004-10-01), None

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