| 摘要 |
An optical device is provided to reduce power consumption required to move a focus of a lens by the attractive force and repulsive force of two magnetic fields and maintain the lens at a target position. An optical device(100) includes a base(110), two guide bars(120), a coil(130), a lens housing(140), a magnetic member(150), a magnetic-permeable member(160), a magnetic filed sensing member(170), a positioning member(180), a lens(190), and an image-sensing member(195). The guide bars are connected to the base. The coil is positioned in the base. A central axis(A) of the coil is parallel to a central axis(B) of each guide bar. The lens housing may slide along the central axis of each guide bar. The magnetic member is connected to the lens housing with being aligned to the coil. The magnetic field sensing member is positioned in the base with aligned to the magnetic member. The magnetic field sensing member senses the movement of the magnetic member. The image sensing member is positioned at the base while facing the lens.
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