Lens drive unit
AssigneeCM Technology Co., Ltd.
InventorYutaka USHIODA
Life of this patent
Estimating the term…
Abstract
A lens drive unit according to the present invention includes: a voice coil motor installed around a lens barrel equipped with a lens, and configured to move the lens barrel along an optical axis of the lens; and a guide part configured to guide movement of the lens barrel along the optical axis of the lens with respect to a housing configured to house the lens barrel. The voice coil motor includes a magnet installed on one of the housing and the lens barrel, and a coil and a yoke configured to concentrate a magnetic flux of the magnet that are installed on the other. The yoke is placed so as to press the lens barrel against the guide part by a magnetic force by which the yoke is attracted to the magnet.
Claims29
A lens drive unit comprising:
- a voice coil motor installed around a lens barrel equipped with a lens, the voice coil motor being configured to move the lens barrel along an optical axis of the lens;
- and
- a guide part configured to guide movement of the lens barrel along the optical axis of the lens with respect to a housing configured to house the lens barrel, wherein:
- the voice coil motor includes a magnet that is installed on one of the housing and the lens barrel and a coil and a yoke that are installed on the other, and the yoke is configured to concentrate a magnetic flux produced by the magnet;
- and
- the yoke is placed so as to press the lens barrel against the guide part by a magnetic force by which the yoke is attracted to the magnet.
A lens drive unit comprising:
- a lens barrel equipped with a lens;
- a housing installed around the lens barrel and configured to house the lens barrel;
- a first voice coil motor configured to move the lens barrel along an optical axis of the lens with respect to the housing;
- and
- a first guide part configured to guide movement of the lens barrel with respect to the housing,
- wherein the first voice coil motor includes a magnet that is installed on one of the housing and the lens barrel and also includes a coil and a yoke that are installed on the other, and the yoke is placed so as to press the lens barrel against the first guide part by a magnetic force by which the yoke is attracted to the magnet,
- the lens drive unit further comprising:
- a support cover configured to support the housing on one face side of the lens;
- a second voice coil motor configured to move the housing in a vertical direction to the optical axis of the lens with respect to the support cover;
- a second guide part placed between the housing and the support cover so as to come in contact with the housing and the support cover and configured to guide movement of the housing with respect to the support cover;
- and
- a connection member configured to connect the housing to the support cover, wherein:
- the second voice coil motor includes a magnet installed on one of the housing and the support cover and also includes a coil and a yoke installed on the other;
- and
- the connection member is configured to connect the housing to the support cover with a constant distance kept.
A lens drive unit comprising:
- a lens barrel equipped with a lens;
- a housing installed around the lens barrel and configured to house the lens barrel;
- a voice coil motor configured to move the lens barrel along an optical axis of the lens with respect to the housing;
- and
- a guide mechanism configured to guide movement of the lens barrel along the optical axis of the lens with respect to the housing, wherein:
- the guide mechanism includes a main guide part and a sub guide part, the main guide part is placed in a predetermined position around the lens barrel, and the sub guide part is placed in another position located opposite the predetermined position around the lens barrel where the main guide part is placed, across the lens barrel;
- and
- the voice coil motor includes a magnet installed on one of the housing and the lens barrel and also includes a coil and a yoke installed on the other, and is configured to apply a force pressing the lens barrel against the main guide part and a force by which the lens barrel pulls the housing via the sub guide part, by a magnetic force by which the yoke is attracted to the magnet.
Dependencies are inferred from the claim text.