Abstract: The present invention aims to provide a lens driving device which can prevent a lens support from being suspended in an inclined state and can correspond to energizing amount and carry out appropriate linear movement action. A front side primary coil and a rear side primary coil are respectively wound around an axis parallel to an optical axis in a manner of being coaxial to a secondary coil and are combined with each other through electromagnetic induction. The secondary coil is such disposed that its two coil terminals are connected with two ends of a diode respectively. The secondary coil and a permanent magnet assembly are arranged opposite to each other at an interval along the radial direction and a driving current is supplied to the primary coils.

Abstract: In one embodiment, an optical pickup device includes a fixed portion 100, a movable portion 11, first and second elastic supporting members 12a and 12b, one and the other ends of which are secured to the fixed portion 100 and the movable portion 11, respectively, and an objective lens 8 secured to the movable portion 11. The objective lens 8 is arranged inside of the area that is defined between two lines that are respectively drawn from one and the other ends of the first elastic supporting member 12a perpendicularly to the first elastic supporting member 12a and outside of the area defined between the first and second elastic supporting members 12a and 12b.

Abstract: Disclosed are a pickup device assembly and an optical drive system. The assembly may comprise: a laser generator for generating laser beams; an objective lens; and at least one piezoelectric actuator for generating bending moments once applied with voltages, wherein the generated bending moments move the objective lens such that the laser beams are focused by the objective lens and then aim at concentric spiral data tracks of a disc with a strongest reflected signal of the laser beams from the disc.

Abstract: An optical pickup device is provided with: a light source; an objective lens focusing light from the light source on an information recording surface of an optical recording medium; a lens holder holding the objective lens; and a collision prevention member provided on the lens holder, and preventing collision between the optical recording medium and the objective lens. The collision prevention member is formed with a sheet member, and is disposed on the lens holder so that a side surface, substantially parallel to a thickness direction, of the sheet member faces the information recording surface.

Abstract: An objective lens is made of a resin material and focuses incident rays, which have a wavelength of 410 nm or less and are emitted from a light source, on an optical disc at a numerical aperture of 0.8 or more, wherein when a lens tilt sensitivity is defined as an amount of a 3rd-order coma aberration caused per a lens tilt of 1 degree which is an angle formed between an optical axis of the objective lens and a system optical axis of an optical system including the objective lens at 0° C., the lens tilt sensitivity is 130 m?rms/degree or less.

Abstract: In the invention, a movable lens varying the rate of convergence or divergence of light reaching an objective lens by moving in an optical axis direction has its position adjusted to correspond to ambient temperature. The objective lens is arranged to be tilted with respect to an optical axis of light reaching the objective lens from the movable lens. First coma aberration of which the amount produced varies according to movement of the movable lens, and second coma aberration of which the amount produced varies due to variation in the warping state of an optical disc that is caused along with variation in ambient temperature both occur in the radius direction of the optical disc, and the objective lens has its tilting direction adjusted such that the first coma aberration and the second coma aberration have their increasing and decreasing directions of the amount of coma aberration produced with respect to variation in ambient temperature reversed.

Abstract: The invention provides an optical disk drive. The optical disk drive comprises a pickup head, a seek control device, a lens vision characteristic decoder, and an anti lens shift device. The pickup head comprises a sled and a lens for projecting a beam on a disk. The seek control device moves the sled, and shifts the lens with a shift distance relative to an origin at a center of the sled. The equalizer derives a servo signal from a reflection of the beam. The lens vision characteristic decoder obtains a vision characteristic of the lens according to the servo signal and determines a track-on direction according to the vision characteristic. The anti lens shift device triggers the seek control device to perform a track-on process according to the track-on direction.

Abstract: In an objective lens actuator of an optical disk drive and the like, variations in the fixed end positions of wires serving as suspensions are reduced and tilt characteristics are improved. Terminal plates 20 fixed to a lens holder are tilted relative to wires 13 for supporting the lens holder with elasticity, and are soldered at the edges of the terminal plates 20, so that variations in the fixed end positions of the wires 13 are reduced.

Abstract: Means (101a) for evaluating positional control deviation and means (102a) for outputting a corrective signal, this being a set of signals with kick and brake functions, to an actuator (10) on the basis of the evaluation result are provided. Although control deviation may increase due to external shock or vibration acting on the disc device or when a disc having eccentricity, wobble, or another physical deformity is reproduced, the control deviation is suppressed without loss of control stability, and stable recording and reproducing is always possible.

Abstract: A magnetic circuit and an optical recording and/or reproducing apparatus employing the magnetic circuit, having: a magnet with first and second magnetic portions adjacent to each other and opposite in polarity, and third and fourth magnetic portions surrounding the first and second magnetic portions, respectively, and have opposite polarities to the first and second magnetic portions, respectively; and at least one of a tracking coil unit or a focus coil unit. The tracking coil unit has first through third tracking coils arranged in a tracking direction so that each tracking coil interacts with two of the first through fourth magnetic portions. The focus coil unit has first through fourth focus coils, two of which are disposed in a focus direction to interact with the first and third magnetic portions, and the remaining two of which are disposed in the focus direction to interact with second and fourth magnetic portions.

Abstract: In an optical element feeding device and an optical pickup unit using the same, in order to make the device compact and light and achieve a stable operation, the device has a main shaft and a sub shaft supporting a movable frame in which an optical element is arranged in such a manner as to be movable in a direction of an optical axis, a stepping motor, a lead screw rotating on the basis of a rotation of the stepping motor, a resin nut engaging with the lead screw and being movable in the direction of the optical axis on the basis of the rotation of the lead screw, and a spring pressing the movable frame in the direction of the optical axis so as to bring the movable frame into contact with the nut, and a cushioning material is provided between the nut and the movable frame so as to connect the nut and the movable frame.

Abstract: An optical pickup actuator independently drivable in focusing, tilting and tracking directions. The optical pickup includes a lens holder movably installed on a base, and mounted with an objective lens for transmitting an incident light to an optical information recording medium; and a magnetic circuit to independently driving the lens holder in the focusing, tilting and tracking directions. The magnetic circuit includes opposing magnets; a focusing coil and tilting coils interposed between the magnets, mounted inside the lens holder, and wound around respective axes parallel to the focusing direction; and a plurality of tracking coils mounted outside the lens holder, interposed between the magnets and wound around respective axes transverse to the focusing direction. The magnetic fields of the magnets are guided by outer yokes partially encompassing the magnets and inner yokes positioned within the focusing coil and the tilting coils.

Abstract: An optical pickup apparatus and an optical recording/reproducing system including the same, the optical pickup apparatus includes at least two optical systems for different types of optical recording media, one of objective lenses of the optical systems being offset from a central line of the optical recording medium, wherein the optical system including the offset objective lens having a diffraction grating diffracting light emitted from a light source to form a main beam and sub-beams, wherein the diffraction grating includes first and second diffraction regions having different grating patterns arranged alternately thereon, and a center of each sub-beam is arranged at a boundary of the first and second diffraction regions of the diffraction grating, and a center of the diffraction grating and an optical axis of the light source are adjusted to be coincided with each other, preventing generation of an alternating current in a Push-Pull signal of the sub-beams.

Abstract: There is provided an optical disk device that performs a focus jump operation in a stable and prompt manner. The optical disk device includes an objective lens, a light-detecting element, a lens holder, a shaft member configured to penetrate a hole, a focus drive mechanism, a focus drive circuit, a tracking rotation mechanism, a tracking drive circuit, and a control circuit. The control circuit includes a drive control portion, a wobble control portion, and a switch portion. The drive control portion generates a control signal to be input to the focus drive circuit and a control signal to be input to the tracking drive circuit. The wobble control portion generates a control signal indicating that a current value should fluctuate. During a period of focus jump, the switch portion introduces into the tracking drive circuit the control signal generated by the wobble control portion.

Abstract: An optical head, capable of performing output control for a light source without weakening an intensity of a light beam for recording and reproduction even if an optical element is not added anew, and an optical recording and reproducing apparatus including the optical head. Light fluxes near the center of an optical beam emitted from a light source are made incident on a diffractive element and transmitted through a beam splitter or the like to be irradiated on an optical recording medium. On the other hand, a part of peripheral light fluxes of the light beam are reflected in a direction substantially perpendicular to an optical axis by a reflection surface of a holder provided at an end of the diffractive element. Light beams reflected on the reflection surface are made incident on a photo-detector, and the photo-detector converts the light beams into an electric signal for output monitor of the light source according to an amount of received light.

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: A lens holder is provided with a focusing coil for urging the lens holder in a focusing direction and tracking coils for urging the lens holder in a tracking direction in cooperation with magnets. A magnet is disposed in a space where the focusing coil and the tracking coil are opposed to each other in a through hole of the lens holder, such that a magnetized surface on one surface side of the magnet is opposed to the focusing coil and a magnetized surface on the other surface side thereof is opposed to the tracking coil.

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 mirror actuator includes a piezoelectric element having a thickness in a direction perpendicular to a surface of the mirror, and a circular surface bonded to a circular rear surface of the mirror such that the center of the circular surface of the piezoelectric element and that of the circular rear surface of the mirror match. The piezoelectric element receives a potential to cause the circular surface bonded to the mirror to expand/contract radially around 360 degrees by a uniform ratio to allow the mirror to have a surface modified in geometry. The piezoelectric element is adjusted in thickness so that as the piezoelectric element expands/contracts, the piezoelectric element allows the mirror to have a surface with a ratio of a radius of curvature in a radial direction of the mirror to that of curvature in a tangential direction of the mirror of (cos(2?)+1)/2, where ? represents an angle of incidence on the surface of the mirror.

Abstract: An autofocus actuator is provided by which it is possible to easily confirm that a holder and a yoke do not make contact with each other even when the space between the holder and the yoke is made as small as possible in order to improve shock resistance. The autofocus actuator includes light transmission holes for confirming a space between an inner peripheral surface of an inner cylindrical portion of the yoke and an outer peripheral surface of a cylindrical portion of the holder provided with a lens unit and being capable of adjusting its position in the optical axis direction by supplying electrical power to a coil secured to the holder. The light transmission holes are provided at predetermined positions of a flange portion of the holder and a stopper for attaching a leaf spring to the holder, respectively, so that light can pass therethrough.

Abstract: An optical pick-up includes a lens holder and a lens holder supporting portion. The lens holder has a focusing coil, a tracking coil, and a pair of nickel plates arranged to sandwich the focusing coil from the top and the bottom. The lens holder supporting portion includes a pair of permanent magnets having their magnetic poles of the same polarity opposite to each other and sandwiching the lens holder as seen in two dimensions. A sidewall of a slide hole is pressed against a slide shaft. Thus, a disk drive which can suppress a jerky motion of the lens holder when it moves along the slide shaft with a simple mechanism is provided.

Abstract: An objective lens has an actuator base and a lens holder for supporting an objective lens. The lens holder has a shaft hole. A shaft is disposed on the actuator base and fitted to the shaft hole. A cover is attached to the actuator base so as to cover the lens holder in a manner that the cover comes into contact with or comes close to the top face of the shaft. Protrusions are disposed on an actuator base opposing face and a cover opposing face of the lens holder without contacting the shaft. When the protrusions are contacted with the actuator base and the cover, a predetermined gap is formed between the lens holder and the actuator base and between the lens holder and the cover, the gap is communicated with a space in the cover through the side of the protrusions.

Abstract: An objective lens driving apparatus is used for accurately positioning an abject to focus a light spot on an optical recording medium. A lens holder holds the objective lens and has a bearing hole through which a shaft extends in a direction parallel to the optical axis so that the lens holder is rotatably supported on the shaft. Two magnets are supported on the lens holder so that the shaft is between the magnets. A base has two magnetic members disposed such that each of the two magnets exerts an attraction force on a corresponding one of the two magnetic members to urge the lens holder in a direction of the optical axis and in a direction perpendicular to the optical axis. A first coil set of first focusing and tracking coils and a second coil set of focusing and tracking coils are mounted to the two magnetic members.

Abstract: A pickup head actuator for carrying a plurality of near-field optical I/O elements, far-field optical I/O elements, or magnetic I/O elements. Besides performing focusing and tracking servo, the attraction due to magnetic inductor and tracking magnet enables a base to float at different heights in its normal state, suitable for different types of I/O elements.

Abstract: A tilt detection system includes an optical disk having a series of data recorded therein, the series of data having a pulse width smaller than the minimum pulse width of data recorded in an ordinary optical disk; a reproducing part reproducing a signal from the optical disk by emitting a light beam onto the optical disk; and a tilt detecting part detecting a tilt of the light beam with respect to the optical disk based on a reproduced RF signal provided by the reproducing part when the series of data having the smaller pulse width is reproduced.

Abstract: An optical pickup apparatus includes a first optical system for recording or reproducing signals to or from a first optical recording medium; a second optical system for recording or reproducing signals to or from a second optical recording medium; a holder for accommodating the first optical system and the second optical system on substantially the same plane; a focusing driving device for moving the holder in a first direction parallel to an optical axis of the first optical system and the second optical system; a tracking driving device for rotating the holder in a second direction perpendicular to the optical axis of the first optical system and the second optical system; a switching device for placing the first optical system on an optical path for recording or reproducing signals to or from the first optical recording medium, and for placing the second optical system on the optical path for recording or reproducing signals to or from the second optical recording medium; and a variable distance driving d

Abstract: An objective lens driving apparatus used with an optical pickup includes a base, a holder provided on the base, a blade on which an objective lens is mounted, an elastic support body elastically supporting the blade and which is capable of moving with respect to the holder, a pair of magnetic members installed on the base to face each other, and a coil assembly including a focus coil, a tracking coil, and a tilt coil, the coil assembly being installed at the blade so as to be disposed between the magnetic members. Thus, coils needed to change the position of an objective lens are incorporated into a single coil assembly and are arranged between a pair of magnets, and an installation space is small so that the apparatus can be made compact.

Abstract: A device for refracting beams of light, in particular laser beams, with at least one refraction component which can be adjusted by means of a drive unit. The drive unit is formed from the drive of a read/write head of a magnetic data storage component.

Abstract: The present invention is directed to an object lens drive device adapted for moving an object lens (21) in a focus direction of optical axis direction and in a tracking direction perpendicular to the optical axis direction, and comprises a fixed portion (10) provided in such a manner that a supporting shaft (14) is projected, a movable portion (11) comprised of an object lens (21), and a bobbin (16) adapted so that the object lens (21) is attached and a hole (18) through the supporting shaft is inserted is formed, the bobbin (18) being supported movably along the supporting shaft and rotatably with the supporting shaft being as center, a drive portion including a magnet portion provided at either one of the fixed portion and the movable portion, and a coil portion (22) provided at the other portion to move the movable portion along the supporting shaft to thereby move the object lens in the focus direction, and to rotate the bobbin with the supporting shaft being as center to thereby move the object lens in t

Abstract: An objective lens driving apparatus is used for accurately positioning an abject to focus a light spot on an optical recording medium. A lens holder holds the objective lens and has a bearing hole through which a shaft extends in a direction parallel to the optical axis so that the lens holder is rotatably supported on the shaft. Two magnets are supported on the lens holder so that the shaft is between the magnets. A base has two magnetic members disposed such that each of the two magnets exerts an attraction force on a corresponding one of the two magnetic members to urge the lens holder in a direction of the optical axis and in a direction perpendicular to the optical axis. A first coil set of first focusing and tracking coils and a second coil set of focusing and tracking coils are mounted to the two magnetic members.

Abstract: An objective lens has an actuator base and a lens holder for supporting an objective lens. The lens holder has a shaft hole. A shaft is disposed on the actuator base and fitted to the shaft hole. A cover is attached to the actuator base so as to cover the lens holder in a manner that the cover comes into contact with or comes close to the top face of the shaft. Protrusions are disposed on an actuator base opposing face and a cover opposing face of the lens holder without contacting the shaft. When the protrusions are contacted with the actuator base and the cover, a predetermined gap is formed between the lens holder and the actuator base and between the lens holder and the cover, the gap is communicated with a space in the cover through the side of the protrusions.

Abstract: In an optical disc apparatus for recording and/or reproducing data on an optical disc, a lens holder for holding an objective lens is dynamically moved not only in a direction perpendicular to a data recording face of an optical disc but also in a direction parallel to the data recording face and crossing substantially at right angle with data recording tracks on the data recording face when the optical disc is loaded on the optical disc apparatus so as to remove the stick of the movement of the objective lens due to adhesion of dust, break or deformation of the components.

Abstract: It is an object to perform a thin and compact design of the objective lens driving device. In order to achieve the above object, optical beam is passed through a space surrounded by a tracking coil and a focusing coil which are adjacent to each other and fixed in a holder. Further, it is another object to position the objective lens with high precision in an objective lens driving device for switching a plurality of objective lenses in accordance with the type of an optical disc. In order to achieve this object, magnetic substances which are radially extended with the sliding shaft at the center are provided in the lens holder, and the magnetic substances are located within a plane perpendicular to the plane constituting the magnetic gap and at the outside of the magnetic gap. Still further, in an objective lens driving device it is another object to prevent the occurrence of positional displacement of the objective lens due to resistance force of current supply means such as FPC.

Abstract: It is an object to perform a thin and compact design of the objective lens driving device. In order to achieve the above object, optical beam is passed through a space surrounded by a tracking coil and a focusing coil which are adjacent to each other and fixed in a holder. Further, it is another object to position the objective lens with high precision in an objective lens driving device for switching a plurality of objective lenses in accordance with the type of an optical disc. In order to achieve this object, magnetic substances which are radially extended with the sliding shaft at the center are provided in the lens holder, and the magnetic substances are located within a plane perpendicular to the plane constituting the magnetic gap and at the outside of the magnetic gap. Still further, in an objective lens driving device it is another object to prevent the occurrence of positional displacement of the objective lens due to resistance force of current supply means such as FPC.

Abstract: In a pickup 5 laterally moving by being guided at its one side by a main shaft 4, an inclined piece 5a tilted frontwardly and obliquely downwardly in an opening portion 1a inside a chassis 1 is opposite to the shaft 4. A screw 6 for adjusting the tilt angle of the pickup 5 is obliquely upwardly or downwardly screwed into the inclined piece 5a, and its lower part is placed inside the pickup 5. A flange-like holding portion 6A which is integral with the lower part of this screw 6 is fitted to the opposite opening edge 1b, and the bottom surface edge 6b partially abuts against the chassis 1 top surface and the edge 6b laterally moves by sliding along the top surface when the pickup 5 laterally moves. The edge 6b slides along the top surface near the edge 1b when the pickup 5 laterally moves.

Abstract: A disk device includes a base that has a support shaft and magnets, and a movable unit that is supported on the support shaft rotatably about the shaft and slidably along the shaft and that has a focusing coil and a tracking coil. The movable unit is constituted in such a way that its first member and its second member are joined together. Provided on the first member are a holder part that holds an objective lens and a supported cylinder part that is supported by the support shaft. Provided on the second member are end part wind-around parts around which are wound the end part of the focusing coil or the end part of the tracking coil, and a coil bobbin part. The first member is formed of a material having greater rigidity and slidability than the second member, and the second member is formed of a non-electrically-conductive material having greater heat resistance than the first member.

Abstract: A disk device includes a base that has a support shaft and magnets; a movable unit that is supported on the support shaft rotatably about the support shaft and slidably along the support shaft, holds an objective lens, and has a focusing coil and a tracking coil, and magnetic members that are formed in linear shape and are attached to the movable unit, and hold the movable unit in a neutral position in a focusing direction and in a tracking direction by attraction of the magnet members to the magnets. The device is used for receiving a disk recording medium for recording or playback by transmitting laser light through an objective lens held by the movable unit.

Abstract: One surface of an objective lens is provided with a zonal part which acts such that the quantity of light having a wavelength of &lgr;1 is apparently canceled in the outer peripheral portion of the luminous flux due to an interference effect, whereas the quantity of light having a wavelength of &lgr;2 in the outer peripheral part is kept as it is. The zonal part has such a step that light supposed to pass a position corresponding to the zonal part if the zonal part does not exist and light passing a position at which the zonal part is formed if the zonal part exists generate therebetween a phase difference satisfying a predetermined conditional expression. The numerical aperture at a boundary position of the step has a value between two numerical apertures for the respective wavelengths &lgr;1 and &lgr;2.

Abstract: An optical pickup device featuring reduced number of components and improved workability for achieving cost reduction and improved product quality. A base stand (4) is provided with a first guide section (8) and a second guide section (9) which stand upright from the base stand individually and can slidably engage with the first and second engagement portions (11, 12) provided on a mount base (3), respectively. This arrangement permits the base stand (4) having the guide sections (8,9) fixed thereon to be assembled directrly with the mount base (3) including an optical pickup thereon, resulting in simplified assembly operation and enhanced operation efficiency.

Abstract: An optical pickup apparatus includes a first optical system for recording or reproducing signals to or from a first optical recording medium; a second optical system for recording or reproducing signals to or from a second optical recording medium; a holder for accommodating the first optical system and the second optical system on substantially the same plane; a focusing driving device for moving the holder in a first direction parallel to an optical axis of the first optical system and the second optical system; a tracking driving device for rotating the holder in a second direction perpendicular to the optical axis of the first optical system and the second optical system; a switching device for placing the first optical system on an optical path for recording or reproducing signals to or from the first optical recording medium, and for placing the second optical system on the optical path for recording or reproducing signals to or from the second optical recording medium; and a variable distance driving d

Abstract: A galvano mirror unit includes a galvano mirror, a rotor to which the galvano mirror is mounted, a stator that rotatably supports the rotor about a rotation axis, a pair of center pins provided to the stator, and a pair of receive members provided to the rotor. The receive members respectively receive the center pins. The rotor is pivoted by the engagement of the center pin and the receive member.

Abstract: An optical head device capable of stably positioning an information head device even if a distance between the object point and the image point is reduced so as to miniaturize the device can be realized. The optical head device comprises a semiconductor laser emitting a light beam, a lens converging the light beam emitted from the semiconductor laser to a disk and a holding means maintaining the disk at a constant distance from the lens. The optical head device satisfies the following equations 24 and 25: L2=f×L1/(L1−f)  (equation 24) h<L2  (equation 25) wherein f denotes a focal length of the lens, L1 denotes a distance between the semiconductor laser and a first principal point located on the semiconductor laser side of the lens and h denotes a distance between a second principal point located on the disk side of the lens and the disk that is held by the holding means.