Abstract: A lens holder drive device has: a lens holder; a fixing part that includes a base member disposed below the lens holder; a drive mechanism; an upper-side plate spring; a lower-side plate spring; and a position detection unit that detects the position of the lens holder in the optical axis direction. The drive mechanism has: a drive coil fixed to the perimeter of the lens holder; a yoke having a substantially square columnar shape; and a drive magnet disposed to face the drive coil in a first direction which is orthogonal to the optical axis direction. The position detection unit includes: a sensor magnet attached to an outer circumferential surface of the lens holder in a second direction which is orthogonal to the optical axis direction and the first direction; and a magnetic sensing element that faces the sensor magnet and is provided to the base member.

Abstract: A lens driving device, which movably supports a lens assembly along a direction of an optical axis of a lens, includes an actuator base disposed to a lower side of the direction of the optical axis, a lens holder made of a ferromagnet that is disposed to an upper side of the actuator base and which has a tubular portion for holding the lens assembly, a ring-shaped driving coil fixed to the lens holder so as to be positioned around the tubular portion, a yoke covering the lens holder so as to be apart from the driving coil and to oppose to the lens holder in a state where the driving coil is sandwiched therebetween, and a guide arrangement guiding the lens holder along the direction of the optical axis.

Abstract: A leaf spring supports a pillar shaped movable portion disposed in a center portion with respect to a cylindrical fixed portion disposed around the movable portion in the direction of a center axis shiftably so as to position the movable portion in a radial direction. The leaf spring is made of stainless steel having relative magnetic permeability which is not less than 1.1.

Abstract: A lens driving device includes a ring-shaped driving coil fixed to a lens holder so as to position around a tubular portion thereof and a rectangular hollow cylindrical yoke including a plurality of flat-shaped permanent magnets opposite to the driving coil. Each flat-shaped permanent magnet has both ends in a horizontal direction which extend in the proximity of opposed two sides of the yoke. The driving coil is disposed so as to extend up to the vicinity of the both ends in the horizontal direction of each flat-shaped permanent magnet.

Abstract: A leaf spring supports a pillar shaped movable portion disposed in a center portion with respect to a cylindrical fixed portion disposed around the movable portion in the direction of a center axis shiftably so as to position the movable portion in a radial direction. The leaf spring is made of a material having Vickers hardness which is not less than 500 (HV).

Abstract: A lens driving device, which movably supports a lens assembly along a direction of an optical axis of a lens, includes an actuator base disposed to a lower side of the direction of the optical axis, a lens holder made of a ferromagnet that is disposed to an upper side of the actuator base and which has a tubular portion for holding the lens assembly, a ring-shaped driving coil fixed to the lens holder so as to be positioned around the tubular portion, a yoke covering the lens holder so as to be apart from the driving coil and to oppose to the lens holder in a state where the driving coil is sandwiched therebetween, and a guide arrangement guiding the lens holder along the direction of the optical axis.

Abstract: A lens driving device includes a ring-shaped driving coil fixed to a lens holder so as to position around a tubular portion thereof and a rectangular hollow cylindrical yoke including a plurality of flat-shaped permanent magnets opposite to the driving coil. Each flat-shaped permanent magnet has both ends in a horizontal direction which extend in the proximity of opposed two sides of the yoke. The driving coil is disposed so as to extend up to the vicinity of the both ends in the horizontal direction of each flat-shaped permanent magnet.

Abstract: A lens driving device includes a lens holder including a tubular portion for holding a lens assembly, a driving coil fixed to the lens holder so as to position around the tubular portion, and a yoke including a permanent magnet opposite to the driving coil. The yoke includes an outer hollow cylindrical portion having a rectangular cylindrical shape, the permanent magnet includes at least four permanent magnet pieces each having a rectangular cross section. Four magnetic circuit auxiliary members are disposed between four corners of the outer hollow cylindrical portion of the yoke and four ones of the permanent magnet pieces that are disposed at the four corners of the outer hollow cylindrical portion of the yoke.

Abstract: A camera module includes a lens unit; a holder which houses the lens unit therein and is displaceable along an optical axis direction of the lens unit; a coil provided on the holder; a yoke, four main magnets and two flat plate-shaped auxiliary magnets which provide a magnetic field to the coil, in which the yoke has a roughly rectangular and relatively thin box shape of which bottom side is opened so that the yoke is defined by four side wall portions and a top plate portion, and the yoke also has an opening formed in the top plate portion for receiving the holder; upper and lower leaf springs respectively attached to the upper and lower cylindrical end portions of the holder for supporting the holder so as to be displaceable along the optical axis direction; and a base which supports the yoke and the lower leaf spring.

Abstract: A leaf spring supports a pillar shaped movable portion disposed in a center portion with respect to a cylindrical fixed portion disposed around the movable portion in the direction of a center axis shiftably so as to position the movable portion in a radial direction. The leaf spring is made of stainless steel having relative magnetic permeability which is not less than 1.1.

Abstract: A leaf spring supports a pillar shaped movable portion disposed in a center portion with respect to a cylindrical fixed portion disposed around the movable portion in the direction of a center axis shiftably so as to position the movable portion in a radial direction. The leaf spring is made of a material having Vickers hardness which is not less than 500 (HV).

Abstract: A camera module includes a lens unit which constitutes an optical system of the camera module; a holder which houses the lens unit and is displaceable along an optical axis direction of the lens unit, and the coil having a hollow cylindrical portion; a coil having a cylindrical form and provided around the cylindrical portion of the holder; a yoke and magnets provided on the yoke for providing a magnetic field to the coil; upper and lower leaf springs for supporting the holder so that the holder is displaceable along an optical axis direction of the lens unit; and an imaging element provided below the lens unit. The holder has coil holding portions to which the coil is fitted for fixedly providing the coil around the cylindrical portion of the holder without using an adhesive.

Abstract: A camera module for small digital cameras and camera-equipped cellular phones includes a lens unit; a holder housing the lens unit and displaceable along an optical axis; a coil on the holder; a yoke and magnets in the yoke providing a magnetic field to the coil; a leaf spring for supporting the holder; and an imaging element below the lens unit. The leaf spring includes an outer annular portion attached to the yoke, an inner annular portion attached to the holder, and bridge portions coupled between the outer and inner annular portion to resiliently support the inner annular portion. Each bridge portion has an outer and an inner annular portion side base part, and extends between an inner peripheral edge of the outer annular portion and an outer peripheral edge of the inner annular portion, the outer annular portion welded to the top surface of the yoke.

Abstract: A lens driving device includes a lens holder including a tubular portion for holding a lens assembly, a driving coil fixed to the lens holder so as to position around the tubular portion and a yoke including a permanent magnet opposite to the driving coil. The yoke includes an outer hollow cylindrical portion having a rectangular cylindrical shape, the permanent magnet includes at least four permanent magnet pieces each having a rectangular cross section. Four magnetic circuit auxiliary members are disposed between four corners of the outer hollow cylindrical portion of the yoke and four ones of the permanent magnet pieces that are disposed at the four corners of the outer hollow cylindrical portion of the yoke.

Abstract: A camera module includes a holder provided with a lens unit and displaceable along an optical axis; a coil formed from a wound wire having lead wires; a yoke and magnets for providing a magnetic field to the coil; a flexible printed circuit board for supplying an electrical current to the lead wires; and upper and lower leaf springs for supporting the holder displaceably along the optical axis. Each of the upper and lower springs includes an outer annular portion and an inner annular portion, and coupled by bridge portions. Part of the flexible printed circuit board is formed into a tongue part arranged in a space between a bridge portion of the lower leaf spring and the lead wires to prevent contact with the lead wires.

Abstract: A camera module includes upper and lower leaf springs having a stable load characteristic and a holder displaceably held by the leaf springs so that the holder can be stably displaced within a magnetic circuit. The upper spring has an outer annular portion, an inner annular portion provided inside the outer annular portion so as to be displaceable with respect to the outer annular portion and attached to the holder, and a plurality of bridge portions coupled between the outer annular portion and the inner annular portion. The camera module further includes a bridge portion supporting member for supporting a part of at least one of the plurality of bridge portions so that a load characteristic of the leaf spring can be changed.

Abstract: A camera module that can obtain a clear image even in the case where dust is generated inside the camera module due to a shock applied thereto is provided. The camera module includes a base and a cover attached to the base so as to define a space therebetween in which the holder can be displaced.

Abstract: A camera module having a holder including a leans unit and upper and lower leaf springs for displaceably supporting is provided. Each of the leaf springs has an outer annular portion, an inner annular portion, and bridge portions couple between the outer annular portion and the inner annular portion for resiliently support the inner annular portion with respect to the outer annular portion. The inner annular portion of the lower leaf spring is attached to an lower cylindrical end portion of the holder mechanically and reliably, and the inner annular portion of the upper leaf spring is attached to the upper cylindrical end portion of the holder in a state that the inner annular portion is fixedly held between an upper cylindrical end portion of the holder and a stopper.

Abstract: A camera module includes a lens unit; a holder which houses the lens unit therein and is displaceable along an optical axis direction of the lens unit; a coil provided on the holder; a yoke, four main magnets and two flat plate-shaped auxiliary magnets which provide a magnetic field to the coil, in which the yoke has a roughly rectangular and relatively thin box shape of which bottom side is opened so that the yoke is defined by four side wall portions and a top plate portion, and the yoke also has an opening formed in the top plate portion for receiving the holder; upper and lower leaf springs respectively attached to the upper and lower cylindrical end portions of the holder for supporting the holder so as to be displaceable along the optical axis direction; and a base which supports the yoke and the lower leaf spring.

Abstract: A camera module that can obtain a clear image even in the case where dust is generated inside the camera module due to a shock applied thereto is provided. The camera module includes a base and a cover attached to the base so as to define a space therebetween in which the holder can be displaced.