Abstract: Provided is an actuator for a mobile device including a holder having a coil wound along inner side surfaces thereof; a driving unit that is inserted into the holder such that four side surfaces of the driving unit are spaced at a predetermined distance from side walls of the holder, the driving unit having magnets coupled to the respective side surfaces thereof; a pair of suspension wires that are mounted symmetrically with each other on the upper portion of the driving unit such that an arbitrary portion of each suspension wire is bent and directed toward a corner of the driving unit; and a pair of support plates that are coupled to both lower sides of the driving unit such that elastic forces are generated in opposite directions to each other.

Abstract: A camera module includes a lens unit, a magnet mounted around the lens unit, a stator receiving the lens unit and the magnet therein and an elastic element. The stator includes a coil seat and a coil wound therearound. The coil establishes a magnetic field when an electric current is applied thereto. The magnetic field interacts with a magnetic field of the magnet to generate a magnetic force driving the lens unit into telescopic movement. The elastic element includes at least one rib which has a fixed end connected with the stator and an opposite movable end. The moveable end moves together with the lens unit with respect to the fixed end to generate an elastic force during the telescopic movement of the lens unit. The lens unit stops at a focal position when the magnetic force and the elastic force come to a balance.

Abstract: A lens driving device has a stationary part including an iron shell, a movable part including a lens holder for holding a lens therein, and a driving part for moving the movable part relative to the stationary part. The driving part includes a plurality of magnets fixed to the iron shell, and at least one coil fixed to the lens holder. The magnets are divided into at least two layers stacked in the direction of the optical axis of the lens and a plurality of groups along the circumferential direction of the lens. Each magnet is polarized in the radial direction of the lens. The polarities of two adjacent stacked magnetic poles in the same group are opposite to each other so as to cooperatively form a magnetic circuit in a plane parallel to the optical axis direction. The coil includes an axis about which the coil is wound. The coil axis is perpendicular to the optical axis. The coil has an upper part facing one layer of magnets and a lower part facing the other layer of magnets.

Abstract: A high performance focusing actuator of a voice coil motor comprises a retaining unit having a plastic retaining frame; a center portion of the plastic retaining frame being a receiving space; two opposite corners of the receiving space being chamfered; an inner side of each chamfered side being formed with a slide portion; and a metal rear cover plate having a shape corresponding to that of the plastic retaining frame; the metal rear cover plate having an open space coaxial with the receiving space of the plastic retaining frame; an outer side of the metal rear cover plate having four outer plates; each of two opposite corners of each outer plate being formed with an inclined guide surface corresponding to the slide portion of the plastic retaining frame; an iron receiving gap being formed between an inclined guide surface and outer plate; and each iron receiving gap receiving a magnet.

Abstract: A digital camera 100 including a lens unit 1a, and a first actuator 71 and a second actuator 72, which deform by being supplied with electric power, thereby moving the lens unit. The digital camera 100 includes a ROM 12 which stores stop position data in which the operation amount of the actuators for moving the lens unit to a predetermined stop position is defined based on operating properties of the actuators, which corresponds to use environmental conditions of the digital camera. The digital camera 100 includes an operation amount obtaining section (for example, a CPU 13 or the like) for obtaining the operation amount of the actuators from the stop position data stored in the ROM based on the operating properties of the actuators, which correspond to the specified use environmental conditions.

Abstract: A lens module includes a barrel, a first lens, an annular retaining member and three driving devices. The retaining member is arranged in the barrel. The driving devices are arranged on the retaining member. Each of the driving devices has a base attached on the retaining member, a plurality of first electrodes formed on the base and a comb-shaped carrier. The carrier has a beam attached on the base and a plurality of second electrodes extending from the beam and suspended above the first electrodes at a first position. The first lens is carried by the second electrodes. When a first voltage is applied on the first electrodes and a second voltage is applied on the second electrodes, an electrostatic force is generated between the first electrodes and the second electrodes, and the second electrodes are moved down, such that the first lens is brought to a second position.

Abstract: An optical pick-up actuator having a servo control system with increased stability includes a base, a lens holder mounted on the base to be tiltable about a tilting axis of the lens holder, at least one objective lens being mounted on the lens holder, and at least one groove being formed in the lens holder, and a magnet unit mounted on the base and extending into the at least one groove. Walls of the least one groove facing the magnet unit in a direction transverse to the tilting axis include sloping surfaces providing a tilting margin to enable tilting control to be performed.

Abstract: A image stabilization control circuit for an image capturing device, wherein a gyro-equalizer (24) integrates an angular velocity signal from a gyro-sensor (12) in an integration circuit (46). The integration circuit (46) is composed of a low-boost filter (LBF), and a phase delay in a target compensation region is set to a value appropriate for an integration process. Furthermore, a characteristic whereby the LBF reduces the phase delay at higher frequencies is used, compensation is applied to the excess phase delay of the angular signal in the high-frequency region brought about by the effect of the phase delay generated in the high-frequency region by the output signal of the gyro-sensor (12), and the phase delay in the high-frequency region is brought nearer to 90 degrees. This allows the accuracy of the process for determining the required displacement magnitude of a lens to be increased.

Abstract: The invention relates to an apparatus, comprising a lens and a piezoelectric element. The piezoelectric element is configured to bend in response to a voltage applied thereto. The lens and the piezoelectric element are arranged so that the bending causes at least a portion of the lens to move in at least one movement direction. The invention further relates to an according method and computer-readable medium.

Abstract: A lens driving device includes a lens, a moving member that supports the lens, a stationary member that movably supports the moving member, a pitch drive mechanism that drives the moving member in the pitch correction direction, and a yaw drive mechanism that drives in the yaw correction direction. The pitch drive mechanism has first and second magnets provided to the stationary member, and first and second coils provided to the moving member. The yaw drive mechanism has a third magnet provided to the stationary member, and a third coil provided to the moving member. The first and second coils are arranged on opposite sides of the lens when viewed in a third direction that is perpendicular to the pitch and yaw correction directions, and the third coil is arranged on the same side as the first coil with respect to the lens when viewed in the third direction.

Abstract: An inertial drive actuator includes a vibrating substrate configured to be reciprocally moved by small reciprocally displacements generated by a displacement generating unit arranged on a fixing member. The vibrating substrate has a first electrode on a plane of the vibrating substrate and an insulating layer on the first electrode. The inertial drive actuator further includes a mobile object arranged on the plane of the vibrating substrate and having a second electrode on a plane facing the first electrode through the insulating layer, a frictional force control unit configured to control frictional force between the vibrating substrate and the mobile object such that a potential difference is applied across the first electrode and the second electrode to cause electrostatic adsorptive force to act, and a frictional force applying unit configured to frictionally couple the mobile object and the vibrating substrate to each other by magnetic adsorptive force.

Abstract: An objective lens actuator, having a small tilt of an objective lens, for driving the objective lens in a focusing direction and a tracking direction, so as to focus lights on a recording surface of an optical disc, as a recording medium of information, comprises therein: a magnet; a lens holder, which is configured to hold the lens thereon; and four (4) pieces of tracking coils are disposed in a line on a side surface of the lens holder for holding the objective lens thereon, facing to the magnet.

Abstract: Actuator for an optical scanning device, having a focus lens mounted in a lens holder and having a damper base firmly connected to a mount, having a magnet arrangement arranged on the mount, and a coil arrangement interacting with the magnet arrangement, on a printed circuit board, for fine positioning of the focus lens, with the printed circuit board being connected to the damper base by means of elastically flexible suspension means arranged on both sides of the longitudinal axis of the actuator. It achieves the object of designing an actuator such as this in such a way that it has a reduced moment of inertia, because of a reduced mass. For this purpose, the printed circuit board is at the same time a mounting board for the lens holder, and the printed circuit board and the lens holder together form the moving part of the actuator.

Abstract: An objective lens drive and an optical pickup apparatus are provided which can be reduced in size. Two tilt coils and two tracking coils are disposed so that among planes defined by the respective coils, a plane perpendicular to a winding direction thereof is parallel to a reference plane defined on a lens holder at a predetermined reference distance or less, and are disposed at such positions as to be symmetrical to each other about a center of gravity of the lens holder. A focus coil is disposed so that among planes defined by the focus coil, a plane perpendicular to a recording surface of an optical disk is parallel to the reference plane at a predetermined reference distance or less relative to the two tilt coils and the two tracking coils.

Abstract: An optical head device includes a lens holder, a wire support body which supports the lens holder through a plurality of wires, and a plate-like member on which the wire support body is mounted. The plate-like member includes a bottom plate part on which the wire support body is mounted and a rising part raised from the bottom plate part so as to face with a gap to a side face of the wire support body. The wire support body is subjected to surface bonding to the rising part with a first adhesive which is disposed within the gap and mounted on the plate-like member.

Abstract: A lens drive device includes a lens movable body provided with a lens and a drive mechanism for moving the lens movable body from a home position in an optical axis direction of the lens. The drive mechanism includes a magnet and a plurality of coils which is disposed so that the magnet is interposed in the optical axis direction of the lens. An electric current is supplied to the plurality of the coils in a reverse direction to a direction of an electric current, which is supplied to the plurality of the coils for moving the lens movable body, for restricting movement from the home position of the lens movable body. Therefore, swinging and rattling are hard to occur in the lens movable body and thus its impact resistance can be enhanced.

Abstract: A magnetic coupled actuator includes a lens which is movable in an optical axis direction AX, a lens frame which is coupled with the lens, a lens barrel which seals and accommodates the movable lens and the lens frame to be airtight, a permanent magnet which is disposed at an outer side of the lens barrel, facing the lens frame, and is disposed to be movable in the optical axis AX direction, and a wire of which, one end is coupled with the permanent magnet, and which moves the permanent magnet in the optical axis AX direction. At least one of the lens frame and the permanent magnet is a magnetic field generating means.

Abstract: A lens actuating apparatus includes a fixed part, a moving part and at least one flexible part. The moving part is movably located on the fixed part. The flexible part has four contacting portions that form a hollow enclosed body. Two contacting portions that are located at the diagonal direction fasten the fixing part, and the other two contacting portions that are located at another diagonal direction contact the moving part. When the moving part has a movement related to the fixed part, the contacting portions of the flexible part contacted the moving part move far away from the fixed part. Thereby, the moved contacting portions exert a flexible recovery force to the moving part. The flexible part can be fully utilized in a limited space and does not affect the allocation of the other elements.

Abstract: An objective lens actuator according to the present invention is provided with a gel holder having a gel holding hole into which suspension wires to hold an objective lens holder are inserted, a gel injection hole connected to the gel holding hole is formed in a round shape on a side surface of the gel holder, an inner diameter of an outer surface side opening of the gel injection hole is made larger than an outer diameter of a needle of a gel dispenser and an inner diameter of an inner surface side opening of the gel injection hole is made smaller than an outer diameter of the needle. By these arrangement the locating of the needle can be performed when the gel material is injected into the gel holding hole by the gel dispenser, it can be prevented that the gel material adheres to around the gel injection hole, and further, it can be prevented that the suspension wires are deformed by an insertion of the needle into the gel holding hole.

Abstract: An optical pickup device has an actuator, a lens tilt adjusting mechanism for adjusting a tilt of an objective lens by an extending and contracting operation of a piezoelectric element, a light detector for receiving a reflected light from an optical recording medium when an emitted light from a light source is collected on the optical recording medium by the objective lens and detecting electrical signals, and a control unit for controlling drive of the piezoelectric element based on the detection result of the light detector. The actuator has moveable part mounted on the objective lens, a fixed part for movably supporting the movable part, and a moving device for moving the objective lens with entire movable part in a tracking direction and a focusing direction.

Abstract: An object lens unit for an optical pickup device is disclosed. The object lens unit includes a first optical element facing an optical information recording medium; a second optical element positioned on a light source side of the first optical element; and a frame in which the first optical element and the second optical element are fixed. The frame includes a first fitting portion and a second fitting portion, and has a prescribed clearance in a perpendicular direction to the optical axis between at least one of the first fitting portion of the frame and the first optical element, and the second fitting portion of the frame and the second optical element to adjust a position of at least one of the first optical element and the second optical element in a perpendicular direction to the optical axis. An optical pickup device including such object lens unit is also disclosed.

Abstract: A driving system for driving an optical element in a first direction. The system includes a linear actuator for producing a displacement in a second direction perpendicular to the first direction, a displacement picking unit being extendable in a third second direction, perpendicular to both of the first and second directions, for picking out a displacement of the linear actuator, and a direction converting unit, disposed at the third-direction second-direction side of the linear actuator, for converting a direction of the displacement picked out by the displacement picking unit into a third direction, perpendicular to both the first and second directions.

Abstract: A lens actuator includes a carrier having a tubular shape having a through-hole provided therein. The through-hole is arranged to mount a lens therein. The lens actuator further includes plural springs contacting upper and lower surfaces of the carrier, a coil fixed to the carrier, a first yoke, a second yoke, and a magnet contacting the first yoke and the second yoke. The coil is placed between the first yoke and the second yoke. This lens actuator moves the lens by a long distance, and has a small size.

Abstract: An optical disk apparatus that includes: a disk drive device having a guide shaft secured to a chassis and an optical pickup which is rotatably attached to the guide shaft and moves along the guide shaft. The optical pickup comprises a lens holder holding an objective lens for emitting a light beam to be projected onto an optical disk and having a sliding hole, a shaft passing through the sliding hole, a focus coil wound around an outer wall of the sliding hole, and a hexagonal magnetic plate fit over the outer wall of the sliding hole so as to be adjacent to the focus coil. One side of the hexagonal magnetic plate is bent toward the focus coil so that the magnetic plate is inclined with respect to a plane having a normal line parallel to a sliding direction of the lens holder.

Abstract: An optical element drive mechanism is provided which includes (i) a movable portion including at least an optical element having a reflecting surface; (ii) a support member for supporting the movable portion rotatably with respect to a fixing member; and (iii) a drive mechanism including at least a coil and a magnet for driving the movable portion. The pole surface of the magnet is substantially in parallel with the reflecting surface of the movable portion and/or the coil is provided between the magnet and the reflecting surface.

Abstract: A lens module includes: a holder having inner threads; a ring-shaped first support, the first support having outer threads and being threadedly engaged with a first portion of the inner threads of the holder; a ring-shaped second support, the second support having outer threads and being threadedly engaged with a second portion of the inner threads of the holder, at least one lens; a lens barrel, the lens barrel receiving the lens therein; a first magnetic field generator being attached to the lens barrel; and a second magnetic field generator being disposed on the second support. The first magnetic field generator together with the lens barrel is movable between the first and second supports under magnetic forces generated by the second magnetic field generator. A camera module using the lens module is also provided.

Abstract: An actuator includes at least one actuator unit. The actuator unit includes a ring, a plurality of first actuator elements, and a plurality of second actuator elements disposed on the ring. Each of the first actuator elements includes a first driving piece and a second driving piece attached to each other. The first driving piece is attached to the ring and is located between the second driving piece and the ring. A coefficient of thermal expansion of the first driving piece is larger than that of the second driving piece. Each of the second actuator elements includes a third driving piece and a fourth driving piece attached to each other. The third driving piece is attached to the ring and is located between the fourth driving piece and the ring. A coefficient of thermal expansion of the third driving piece is less than that of the fourth driving piece.

Abstract: By maintaining a relative position of coils of a movable unit with respect to fixed magnets in a normal state to stabilize a relative position of the movable unit with respect to the whole of a lens drive assembly, the lens drive assembly is provided as an assembly capable of adjusting the focus of a lens in a satisfactory manner. In a voice coil type lens drive assembly for adjusting the focus of a lens, a spring 6, a yoke 6 with magnets 5 and a movable unit M1 attached thereto, and electrically conductive springs 2, are accommodated in this order on a base 1 and a connecting portion of a cover frame 8 and that of the base 1 are connected together to unite the two components. At the same time, cut-in portions 6d formed in end portions of the yoke 6 which is a metallic yoke are fitted on projections 1e of the base 1 and both are joined together with connections to the cover frame 8 as guide.

Abstract: A voice coil type lens drive assembly for adjusting the focus of a lens is provided which can prevent the occurrence of trouble in the event of exertion on an external force on the lens not only in a completed state of assembly but also during assembly or during disassembly for repair and is applicable also to a downsized lens drive assembly.

Abstract: A lens driving device includes a moving body having a lens and a drive magnet that is moveable with the lens in an optical axis direction of the lens, and a fixed body that moveably supports the moving body in the optical axis direction. The fixed body includes a first drive coil and a second drive coil that are disposed in the optical axis direction and form magnetic circuits with the drive magnet, and a first magnetic member and a second magnetic member that are disposed opposite the first drive coil and the second drive coil, respectively. The moving body is retained at a first position by magnetic attraction working between the drive magnet and the first magnetic member when energization of the first drive coil is stopped. The moving body is also retained at a second position by magnetic attraction working between the drive magnet and the second magnetic member when energization of the second drive coil is stopped.

Abstract: Shafts are fixed to a base and extend in a direction parallel to a center axis of a through hole of the base. Two yoke arrangements are installed to the shafts. A lens holder frame holds a lens, which has an optical axis parallel to the central axis of the through hole of the base. The lens holder frame is axially placed in a space between the two yoke arrangements and is swingably supported by a plurality of wire springs, which are fixed to the base. Drive coils are fixed to the lens holder frame and generate a drive force to move the lens holder frame.

Abstract: There are provided an optical component module and a camera module capable of preventing damage to the camera module, particularly the optical component module against an impact applied from the outside due to falling, etc. of an apparatus on which the camera module is mounted, even if the strength of the case deteriorates due to miniaturizing, slimming, and weight reducing of the camera module. In the optical component module, a lens that is at least one optical component that is movable in a direction of an optical axis is provided within a case having openings and a primary axis shaft that guides movement of the lens in the direction of the optical axis is provided in the openings. By providing the primary axis shaft, deformation of the case can be suppressed. If an optical pickup device is mounted on the optical component module, a camera module can be formed.

Abstract: An optical assembly includes a light path and at least one optic to be positioned in the path. A support arrangement supports the optic having a foot arrangement including at least one foot that receives a direct manipulation with the foot slidingly engaged against a support surface to move the optic relative to the light path. Movement of the foot may move the optic along a predetermined path. The foot defines a footprint for engaging the support surface and receives the direct manipulation in a way which changes the footprint on the support surface to move the optic responsive to changes in the footprint. A movement arrangement may selectively bias the foot against the support surface during a movement mode, intended to permit movement of the foot against the support surface, and in a locked mode, intended to lock the foot against the support surface.

Abstract: A holding apparatus provided with a holding portion for holding a flange portion of an optical element. The holding portion includes a bearing surface block having a bearing surface, which contacts the flange portion, and a bearing surface block support mechanism, which rotatably supports the bearing surface block about a tangential axis of the optical element. This structure holds the optical element with the optical element holding apparatus in a kinematical manner and maintains satisfactory imaging performance in the optical element.

Abstract: An optical pick-up actuator includes a lens holder having tracking and focusing coils which substantially extend in two parallel planes at a side of the lens holder. A magnet system cooperates with the tracking and focusing coils and is arranged separately from the lens holder and extends beyond the planes. The coils are arranged for effecting tilt through cooperation with the magnet system and may be provided at each of two opposite sides of the lens holder.

Abstract: A lens module including a base, a sleeve, a lens, a magnetic permeable column, a coil supporter, a coil, and a magnet set is provided. A bottom of the base has a plurality of bumps. The sleeve is rotatably disposed on the bumps. The lens is disposed in the sleeve, and the magnetic permeable column is disposed beside the sleeve. The coil is disposed between two holes of the coil supporter. The magnetic permeable column is disposed through the holes and the coil. The magnet set is disposed beside the coil. The sleeve has a plurality of step portions and each bump contacts the corresponding step portion. When a current is provided to the coil, the electromagnetic force produced between the coil and the magnet set moves the coil along the magnetic permeable column, to push the coil supporter and accordingly rotate the sleeve coupled with the coil supporter.

Abstract: A lens barrel includes: a vibration reduction mechanism comprising a vibration reduction lens and a drive device that drives the vibration reduction lens, so as to compensate for image vibration; and a shutter unit for exposure control. The drive device and the shutter unit are arranged so as at least partially to overlap in a direction orthogonal to an optical axis of the lens barrel.

Abstract: An optical pickup actuator having: a holder positioned at one side of a base; a lens holder on which an objective lens is mounted, a magnetic driving portion having focusing coils, tracking coils, and tilting coils, and a magnet used to drive the lens holder in focusing, tracking, and tilting directions; at least one support member supporting the lens holder, one end of the support member being combined with the holder, and an other end thereof being combined with the lens holder; and wires installed separate from the support member to apply a current to the focusing coil, the tracking coil, and the tilting coil.

Abstract: A lens barrel including a telescopic cylinder configured to be accommodated within a fixed frame; a plurality of lens groups configured to be retained in the telescopic cylinder; a lens driving device configured to drive the plurality of lens groups along a longitudinal axis of the telescopic cylinder between a collapsed position in which at least one portion of the plurality of lens groups is stored in the fixed frame and an extended position in which the at least one portion of the plurality of lens groups is extended out of the fixed frame; and a retractable lens group configured to be retracted into the fixed frame through an opening in a wall of the fixed frame when the telescopic cylinder is in the extended position.

Abstract: An optical pickup actuator includes a bobbin, support members, and a pair of magnetic circuits. An objective lens is mounted on the bobbin. The support members have first ends fixed on sides of the bobbin and second ends fixed to a holder placed on a portion of a base to allow the bobbin to move with respect to the base. The magnetic circuits are installed on two sides of the bobbin and on the base. Each magnetic circuit includes a tracking coil which moves the bobbin in a tracking direction, a plurality of focusing/tilting coils which moves the bobbin in at least one direction of a focusing direction and a tilting direction having a focusing component, and a magnet which faces the focusing/tilting coils and the tracking coil and have a polarized structure to move the bobbin in the tracking direction and at least one direction of the focusing direction and the tilting direction having the focusing component.

Abstract: An objective lens actuator that can accommodate higher density and speed is provided by improving frequency characteristics of an objective lens. The objective lens actuator includes an objective lens, a cylindrical lens holder that holds the objective lens, and a reinforcement part disposed in an opening opposite to the objective lens of the lens holder. The reinforcement part has a size that occupies one third to one half of the cylindrical wall of the lens holder from the end of an aperture along the optical axis. In this range, the high order resonance frequencies of the lens holder can be increased, and therefore, it is possible to obtain an objective lens actuator that can minimize the vibration amplitude at the high order resonance frequencies.

Abstract: A driving device including: a vibrating body composed of a plurality of electric elements which are arranged to intersect in a predetermined angle, to vibrate based on a high frequency signal; a driven member having disk shape to be rotated by vibration of the vibrating body; a male screw member formed to rotate integrally with the driven member; a female screw member to be engaged threadably with the male screw member and to move by rotation of the male screw member; wherein the vibrating body is arranged on the male screw member side of the driven member.

Abstract: The disclosure generally relates to methods, devices, systems and components configured to position an element in a lens assembly, such as a lens assembly for microlithography, in which the element to be positioned is moved from an actual position to a target position via at least one actuator, and in which at least the positioning movement of the actuator is superimposed with an oscillating movement.

Abstract: A lens barrel is provided which has a compact inner lens mechanism and is able to be manufactured in a small size at low cost. In the lens barrel according to the present invention, a number of shafts can be reduced by making a guiding shaft to be a common guiding shaft. In addition, a guiding shaft is formed only within a moving range of a zoom movable member, and a coil unit is disposed in a space positioned behind the guiding shaft, hence the whole lens barrel can be made compact. On the other hand, since the guiding shaft and a guiding shaft are formed separately, a sleeve section of the zoom movable member and a sleeve section of a focus movable member are made to have sufficient lengths, and also a sufficient length for sliding the respective movable members can be obtained.

Abstract: An actuator includes at least one actuator unit. The actuator unit includes a ring, a plurality of first actuator elements, and a plurality of second actuator elements disposed on the ring. Each of the first actuator elements includes a first driving piece and a second driving piece attached to each other. The first driving piece is attached to the ring and is located between the second driving piece and the ring. A coefficient of thermal expansion of the first driving piece is larger than that of the second driving piece. Each of the second actuator elements includes a third driving piece and a fourth driving piece attached to each other. The third driving piece is attached to the ring and is located between the fourth driving piece and the ring. A coefficient of thermal expansion of the third driving piece is less than that of the fourth driving piece.

Abstract: In an objective lens driving apparatus which includes a lens holder (22) provided with a plurality of coils (23, 24) and swingably supported by a suspension wire (28), and a magnet (27) for supplying a driving force to the lens holder by an electromagnetic action produced between the magnet and the coils, the center (Mc) of the magnet in a height direction is located above the center (Dc) of driving of the lens holder.

Abstract: A lens module including a base, a sleeve, a lens, a magnetic permeable column, a coil supporter, a coil, and a magnet set is provided. A bottom of the base has a plurality of bumps. The sleeve is rotatably disposed on the bumps. The lens is disposed in the sleeve, and the magnetic permeable column is disposed beside the sleeve. The coil is disposed between two holes of the coil supporter. The magnetic permeable column is disposed through the holes and the coil. The magnet set is disposed beside the coil. The sleeve has a plurality of step portions and each bump contacts the corresponding step portion. When a current is provided to the coil, the electromagnetic force produced between the coil and the magnet set moves the coil along the magnetic permeable column, to push the coil supporter and accordingly rotate the sleeve coupled with the coil supporter.

Abstract: A lens module using electromagnetic force to drive the focus-adjusting lens is disclosed. The lens module includes a base, two steel plates, four springs, a bottom plate, a lens holder, a coil, a lens, a top plate, two magnets, a magnet housing and a top cover. The lens holder, the coil and the top plate are disposed outside the circumference of the lens to form a linked body and the coil is clipped between the lens holder and the top plate so as to reduce diameter and volume of the coil. By the two arc magnets disposed on right and left sides of the coil instead of general circular magnets, volume of the magnets is reduced. By the four springs vertically hooked between four corners of two steel plates respectively and four corresponding brackets of the lens holder, the lens is provided with axial traction for focus adjustment. Therefore, the lens with smaller volume moves steadily to adjust the focus.

Abstract: An autofocus actuator is provided with a yoke 320 that comprises an inner cylindrical portion 321 defining an insertion bore 35 through which a hollow body portion of a holder is adapted to be received and an outer cylindrical portion 322 provided outside of the inner cylindrical portion with a predetermined spacing left between the inner cylindrical portion and the outer cylindrical portion by a connecting portion 324. Four tab-shaped portions 325 are integrally formed with an end surface of the outer cylindrical portion 322 of the yoke in such a manner that the tab-shaped portions remain flush with the end surface of the outer cylindrical portion and extend outwardly from the outer cylindrical portion. The tab-shaped portions 325 are so formed as to leave a concave portion 327 between the adjacent tab-shaped portions. This assures that the tab-shaped portion 325 can make contact with a leaf spring in a broader area, thus enabling the leaf spring to be reliably bonded to the yoke 320.

Abstract: An autofocus actuator 1 is provided with a yoke 300 that comprises an inner cylindrical portion 301 defining an insertion bore through which a hollow body portion of a holder is adapted to be received and an outer cylindrical portion 302 provided outside of the inner cylindrical portion 301 with a predetermined spacing left between the inner cylindrical portion 301 and the outer cylindrical portion 302 by a connecting portion, and the yoke 300 is constructed so as to receive a coil 20 in the space of a predetermined gap. The outer cylindrical portion 302 is formed into a generally polygonal cylindrical shape and inner surfaces of the outer cylindrical portion 302 define a plurality of magnet mounting surfaces each having a planar shape. A generally flat plate shape permanent magnet 41 is mounted on each of these magnet mounting surfaces 303.