Abstract: An optical component for an optical pick-up for converging a laser beam having a particular wavelength onto a recording layer of an optical disc. The optical component comprises a base material formed of a resin composition, an undercoating which is formed of three layers of thin films having a same main constituent and is formed on a top surface of the base material, and a functional thin film formed on a top surface of the undercoating. In this configuration, each of a first layer and a third layer of the undercoating is a thin film formed without introducing oxygen, and a second layer is a thin film formed while introducing oxygen. A film thickness of the undercoating falls within a range of 160 nm to 270 nm, and film thicknesses of the thin films constituting the undercoating are substantially equal to each other.

Abstract: In one embodiment of a data storage device, the inside of its housing 111 is divided into first and second spaces 1 and 2 by a chassis 110. The data storage device includes at least one optical pickup 104 that writes data on a storage medium and a heat radiating member 109 which is thermally coupled to the optical pickup 104 to transfer the heat generated by the optical pickup 104. The optical pickup 104 and the heat radiating member 109 are arranged in the first and second spaces 1 and 2, respectively.

Abstract: A flexible cable is provided. The flexible cable includes a base film having a band shape, a plurality of wiring layers disposed on the base film and extending in one direction, and a plurality of elasticity-adjusting patterns attached to a portion of the base film and partially adjusting the elasticity of the flexible cable.

Abstract: An optical disc recording device, wherein, during an OPC process addressing a write-once optical disc provided with only one or two recording layers, a recording power value of an optical pickup is changed within a range from (100?A)% of a reference recording power value to (100+B)% of the reference recording power value, and wherein, during an OPC process addressing a write-once optical disc provided with three or more recording layers of the same type as the aforementioned write-once optical disc, the recording power value of the optical pickup is changed within a range from (100?C)% of a reference recording power value to (100+D)% of the reference recording power value, D being set to be less than

Abstract: An optical recording medium driving apparatus includes: a driving signal generating unit that generates a driving signal for driving a laser beam source; a high frequency superposition unit that performs high frequency superposition on the driving signal; a light receiving unit that receives an optical feedback of a laser beam; an evaluation signal generating unit that generates an evaluation signal from a light reception signal; a storage unit that stores first high frequency superposition amount information corresponding to a high frequency superposition amount for a normal reproduction mode and second high frequency superposition amount information corresponding to an amount that is greater than that represented by the first high frequency superposition amount information; and a superposition amount control unit that performs control so that a high frequency superposition amount based on the second high frequency superposition amount information is set when measuring an evaluation index based on the evalua

Abstract: An optical pickup device, which is capable of inhibiting peeling from a bonded interface and deviation of an optical axis from being caused even by long-term environmental variations, has a photonic device 1, a flexible printed substrate 2, a holding member 3, an optical pickup case 5 and a bonding connection 4 for bonding the holding member 3 and the optical pickup case 5 together. The adhesive enters an inside of the optical pickup case. The adhesive has a cross-sectional area on the outer surface of the optical pickup case in communication with the inside smaller than a cross-sectional area in the inside of the optical pickup case.

Abstract: An optical disc apparatus includes: a chassis; an optical pickup that is movably disposed on the chassis; a flexible member including wiring, which extends out from the optical pickup; and a wall portion that is provided in a standing manner at one end portion of the chassis. In the optical disc apparatus, an opening that allows the flexible member to be disposed in a bent state is formed through the chassis, and a first cutout is formed at the wall portion so as to be continuous with the opening.

Abstract: An optical pickup assembly that has flexible beams that support an objective lens for adjustment in a focusing direction and a tracking direction. The flexible beams are used to support and move the objective lens. A controller operates electromagnetic actuators that move the flexible beams.

Abstract: An optical pickup head is provided, which includes a silicon substrate, in which an aperture and an objective lens are disposed on the silicon substrate; and a laser diode (LD), a 135-degree tilted reflector, and a 135-degree tilted holographic reflector are disposed on the silicon substrate. The two 135-degree tilted reflectors and a holographic optical element (HOE) are fabricated on a slant face structure of an optical platform using a semiconductor process, so all the elements are disposed at a straight zone, and then in combination with bonding of the LD and an optical sensor element, an miniaturization objective is achieved and an optical path is shortened.

Abstract: A disk device includes a disk rotation driving unit 7 provided movably in the direction of the Y axis to a chassis 10 and immovably in the direction of the X axis thereto, a guide rail 1 supported parallel to the X axis by the chassis, and an optical pickup 2 supported by the guide rail 1 and reciprocating in a radial direction of a disk which is rotation-driven by the disk rotation driving unit 7, wherein a positioning part 8 performing the positioning of a rotation center of the disk rotation driving unit 7 by making contact with a rotor unit 7a of the disk rotation driving unit 7 is provided on the optical pickup 2.

Abstract: An optical pickup apparatus includes at least: a light emitting element capable of emitting at least first wavelength light and second wavelength light; and a diffraction grating configured to split the first wavelength light into at least a first main beam and a first sub-beam and to split the second wavelength light into at least a second main beam and a second sub-beam, a following expression (1) being satisfied: 1.05 < Yp ? ? 1 Yp ? ? 2 < 2.50 ( 1 ) where: Yp1 is an interval between the first main beam and the first sub-beam when a first media corresponding to the first wavelength light is irradiated with the first main beam and the first sub-beam, and Yp2 is an interval between the second main beam and the second sub-beam when a second media corresponding to the second wavelength light is irradiated with the second main beam and the second sub-beam.

Abstract: An optical information recording medium includes a recording layer in which a track is formed, the track having recording marks linearly arranged thereon. Each recording mark has a dimension corresponding to a reference mark length, which serves as a reference, in a track direction along which the track extends, the dimension being smaller than dimensions of the recording mark in two directions perpendicular to the track direction.

Abstract: An optical information recording/reproducing device includes a liquid optical element containing a liquid crystal polymer layer in an optical head. A liquid crystal optical element drive unit drives a liquid crystal optical element having a first pattern electrode divided into a plurality of region at one side of the liquid crystal polymer layer in the optical axis direction. The first pattern electrode includes a first region arranged to surround the optical axis and second to ninth regions arranged outside the first regions in such a manner that the circumference is divided eight portions. The liquid crystal optical element drive unit applies an effective voltage to each region. The voltage applied to the respective regions of the pattern region of the liquid crystal optical element is decided in a short time so as to optimize the quality of the reproduction signal.

Abstract: A method of manufacturing the near-field light generating element includes a first cladding forming process of forming a first cladding on a substrate, a near-field light generation portion forming process of forming metal film base material on the first cladding, a core forming process of forming the core base material so as to cover the metal film base material, a patterning process of patterning the core base material and the metal film base material to form the core and the metal film, and a second cladding forming process of forming a second cladding so as to interpose the core between the second cladding and the first cladding, wherein, in the patterning process, the core base material and the metal film base material are collectively patterned by the same process.

Abstract: An embodiment of the invention, to provide a recording method and a storage medium for BCA data with high reliability for a storage medium and a method for reproducing BCA data from the storage medium, and an information recording apparatus and an information reproducing apparatus. In a conventional optical disk, low reliability data is recorded in a data area of BCA. Thus, the thickness of a film material for use in a recording layer oriented to BCA data or close to the inner periphery of the storage medium in the vicinity thereof is formed in uniform thickness by using a substrate of the storage medium, the substrate being formed by being suctioned by means of adsorbing mechanisms formed in an arc shape so as to integrated two of the adsorbing mechanisms to be adjacent to each other.

Abstract: A network-based real-time optic disc writer device has at least two disc writer assemblies and a monitoring unit. Each of the disc writer assemblies has a disc writer unit and host controller with a detection unit. The disc writer unit is electrically connected to the host controller and has a robotic arm, at least two disc writers, and an optic disc deposition zone. The at least two disc writers and the optic disc deposition zone are arranged at one side of the robotic arm to allow the robotic arm to selectively pick up and deposit optic discs and also to allow the at least two disc writers to perform continuous writing to optic discs. The monitoring unit communicates with the host controller of each of the disc writer assemblies, so as to enable ready communication through networks, real-time notification and monitoring and continuous, un-interrupted writing operation of optic discs.

Abstract: A recording device includes a plurality of channels configured to record data to an optical recording medium, a reception unit configured to receive data transmitted from an external device, a storage unit configured to temporarily store the data that is received by the reception unit, and a distribution control unit configured to read the data that is stored in the storage unit and distribute the data by a block unit to the plurality of channels based on transfer time of the data and recording time to the optical recording medium so that record processing of the plurality of channels are simultaneously ended.

Abstract: An optical pickup device, an optical disk drive and method of controlling light performed by the optical pickup device are provided. The optical pickup device includes: a light transmitting system including an object lens for facing a medium having a multi recording layer for storing information, a light source system for providing a plurality of beams used to record information on or reproduce information from the multi recording layer via the light transmitting system, a light-receiving system disposed on a path of a beam reflected from the medium, and a light controller including a light control device for controlling stray light generated in the medium such that the stray light does not reach the light-receiving device.

Abstract: An evaluation method and print wire method which includes (a) fitting a modulation characteristic formula M,m=Msat (1?(Pws?Pasy)/(Pw,m?Pasy)) having a saturated modulation Msat, write start power Pws, and asymptotic power Pasy as parameters to a relation between a plurality of kinds of write power Pw,m and a modulation M,m which is obtained from a signal amplitude of a trial-written signal, and finding an index value of an error; and (b) evaluating whether or not the relation between the write power and the modulation is valid for write power adjustment by using the index value of the error and a predetermined value the print write method further including (c) setting the write power based upon the result of evaluating and executing a write power process with the set write power.

Abstract: An information erasing device includes a recording section where recording is performed with regard to a disk-shaped recording medium, and a control section which controls the recording section so that the recording section overwrites a part of a erasing target sector so as not to overlap in a radius direction of the disk-shaped recording medium.

Abstract: Manufacturing of a higher quality write-once type multilayer optical disc is facilitated. The optical disc includes a plurality of recording layers in which recording or reproduction is carried out by a blue or blue-violet laser beam of a wavelength of about 405 nm. Each of the recording layers includes a recording layer which uses an organic dye. The plurality of recording layers includes a layer in which a groove pattern around a recording mark is deformed when information is recorded, and a layer in which the groove pattern around the recording mark is not deformed when information is recorded.

Abstract: The invention provides an optical disc apparatus which prevents that a laser beam whose power is set at a read power level causes erroneous data recording or deletion. The optical disc apparatus includes an emission controller which controls an amount of an electrical current that a current supply portion supplies to a laser diode in order to control a level of emission power at which the laser diode emits the laser beam. The emission controller has a function to set levels of the emission power at the following transition processings: a transition processing after a read processing and before a write processing, a transition processing after a write processing and before a read processing, a transition processing between two read processings for respective areas, and a transition processing between two write processings for respective areas.

Abstract: A method and system for calibrating an initial driving signal for driving an optical pick-up head of an optical disk drive is provided. On one embodiment, said optical disk drive is utilized for reading or writing data on an optical disk, the optical disk includes a plurality of auto power control areas (APC areas) and a plurality of data areas, and the APC areas and the data areas are interleaved in between. In at least one of the APC areas that before the data areas for a normal data writing, an initial driving signal is used for the normal data writing to drive the optical pick-up head to emit laserbeam. A detected level of the laserbeam is then obtained. An update initial driving signal is then calibrated according to the detected level and a target level.

Abstract: An optical disc device comprising: a controller for reading data from an optical disc having a plurality of recording layers, wherein: the controller, in shifting a focus of the laser light from a first layer to a second layer, performs a first change that changes a setting on the high frequency signal to a predetermined value at which the high frequency signal is superimposed to suppress peak power of the drive signal if a light density of the second layer is higher than a light density of the first layer; the controller shifts the focus from the first layer to the second layer; and the controller, after the focus has been shifted, performs a second change that changes the setting on the high frequency signal to a predetermined value at which the high frequency signal is superimposed to increase the peak power of the drive signal.

Abstract: An optical disc apparatus capable of deriving optimum laser beam power even when OPC areas overlap with one another and a method for the apparatus. OPC result is recorded to an optical disc and OPC (area-saving OPC) that reduces an area use quantity by using the OPC result is executed and optimum laser power is determined.

Abstract: A complex objective lens composed of a hologram and an objective lens, capable of realizing stable and high-precision compatible reproducing/recording of a BD with a base thickness of about 0.1 mm for a blue light beam (wavelength ?1) and a DVD with a base thickness of about 0.6 mm for a red light beam (wavelength ?2). In an inner circumferential portion of the hologram, a grating is formed, which has a cross-sectional shape including as one period a step of heights in the order of 0 time, twice, once, and three times a unit level difference that gives a difference in optical path of about one wavelength with respect to a blue light beam, from an outer peripheral side to an optical axis side. The hologram transmits a blue light beam as 0th-order diffracted light without diffracting it, and disperses a red light beam passing through an inner circumferential portion as +1st-order diffracted light and allows it to be condensed by an objective lens.

Abstract: A driving device includes: n pickups; n first control means for respectively controlling the pickups; and a second control means for controlling the n first control means so as to divide data into n pieces of data and to write divided data on a predetermined disc through the n pickups, wherein, when a notification that defect is detected is received from at least one first control means from among the n first control means while data is being written on the disc, the second control means determines a replacement destination, notifies information regarding the replacement destination to the n first control means, and determines the replacement destination in a region where data is continuously read at the time of reproducing of the disc.

Abstract: An optical disc drive apparatus includes: a plurality of optical heads reading out data recorded on an optical disc; and a control section respectively controlling a readout operation and a seek operation for the data of the optical heads. The control section includes a first mode in which when reading out a data group for reproduction of images or audio which are recorded on the optical disc, a readout amount of the data group is allocated to each optical heads and the readout operations of the optical heads are respectively controlled, and a second mode in which when reading out the data group for reproduction of the images or audio which are recorded on the optical disc, the readout operations of the optical heads are respectively controlled so that each optical head reads out the data group. The control section can dynamically switch the first and second modes.

Abstract: A recording and reproducing unit includes: a first optical head having at least one route of laser beam irradiation system that irradiates an optical disc recording medium with a laser beam; a second optical head having plural routes of laser beam irradiation systems that irradiate the optical disc recording medium with laser beams; and a control part that performs control of, while allowing the laser beam irradiation system that the first optical head has to execute recording of information in the optical disc recording medium, allowing the plural laser beam irradiation systems that the second optical head has to execute simultaneous reproducing of the information recorded in the optical disc recording medium.

Abstract: An optical drive device for performing information recording or reproduction of recorded information by formation of a mark by focusing a first light at a necessary position in a recording layer of an optical recording medium by an objective lens includes a position control unit configured to focus a second light on a reflection film, in which a position guide element of the optical recording medium is formed, through the objective lens and to enable the spot position of the second light to follow the position guide element based on the reflected light of the second light focused on the reflection film so as to control the position of the objective lens. The optical drive device further includes a first focusing unit, a first light-sensing portion, and a surface reflection light deviation amount detection unit.

Abstract: An optical pickup compatible with different types of optically recorded media and an optical recording and/or reproducing system employing the compatible optical pickup, the compatible optical pickup including: a short wavelength light source emitting a short wavelength light; a low-density optical system emitting a long wavelength light; an objective lens focusing lights incident from the long wavelength light source and the low-density optical system onto an information storage medium; a single photodetector (PD) receiving the short and long wavelength lights reflected from the information storage medium; a detection lens focusing the short and long wavelength lights reflected from the information storage medium as a light spot onto the single PD; a first collimating lens positioned on an optical path of a light reflected, wherein the optical path is positioned between the objective lens and the single PD; and a driving unit adjusting a position of the first collimating lens.

Abstract: An optical pickup device corresponding to an optical recording medium having a plurality of recording layers, and an optical drive using the device are provided. The optical pickup device includes a collimator lens disposed between an object lens and a light source. The collimator lens adjusts a focal length with respect to the optical recording medium, and the object lens focuses light passing through the collimator lens, on the optical recording medium. The object lens is optically optimized for an upper or second-upper recording layer of the optical recording medium.

Abstract: The invention relates to the field of the optical recording of information on a medium, such as an optical disc. To read an optical disc in super-resolution mode, a procedure for optimizing the power of the read laser beam is implemented. This optimization is based on the observation that a correlation exists between the power allowing the disc to be read without risk in super-resolution mode and the reflectivity of the sensitive layer containing the information. The reflectivity of the optical disc is measured for several power levels of the read laser, a critical power is determined on the basis of the reflectivity measurements made, and a read power sufficiently above the critical power, so as to be well outside a range of power levels entailing risks, is selected according to the critical power.

Abstract: An information recording medium according to the present invention includes at least three information recording layers. If the readout power of a laser beam in reading information from an information recording layer L(n) is identified by Pw(n), and if the readout power of the laser beam in reading information from an information recording layer L(n+a) is identified by Pw(n+a), then a base thickness between the information recording layers is determined so that the intensity of the light when the information recording layer L(n+a) is irradiated with a laser beam having the readout power Pw(n) becomes equal to or lower than that of the light when the information recording layer L(n+a) is irradiated with a laser beam having the readout power Pw(n+a).

Abstract: Amplitude and frequency of a high-frequency signal superposed on a reproduction laser beam are changed in accordance with a reproduction spot diameter on the surface of the recording layer upon discrimination of an optical disk in initial adjustment after insertion of the optical disk and change of a layer of a multi-layer optical disk. Further, the high-frequency signal is not superposed on the reproduction laser beam until end of the discrimination and change to a target layer upon discrimination of the optical disk and change of a layer of a multi-layer optical disk.

Abstract: Directed to freely adjusting an emission period of a semiconductor laser. In the present invention, pulsed light serving as pulse-shaped laser light (LL) is emitted from a semiconductor laser (3), and a laser drive voltage (DJ) that is generated on the basis of a pulse signal (SL) and that has pulse-shaped drive voltage pulses (DJw) is applied to the semiconductor laser (3). At this time, a short-pulse light source (51) varies a voltage period (TV) corresponding to an interval between the drive voltage pulses (DJw), thereby varying a set period (TS) corresponding to an interval between generated signal pulses (SLw) in the pulse signal (SL).

Abstract: An information recording apparatus (1) is provided with: a recording device (102) for recording information onto an information recording medium (100) by irradiating the information recording medium with a recording laser beam (L); a controlling device (103) for recording calibration data onto the information recording medium by using the recording laser beam in which the power is adjusted gradually; and a detecting device (107) for detecting degree of modulation of a reproduction signal after the recording of the calibration data, the recording of the calibration data being ended if the degree of modulation exceeds a predetermined range, an optimum power of the recording laser beam being determined from a jitter amount included in a reproduction signal.

Abstract: A recording apparatus (1) comprises a first calculating means (22) that calculates an optimum power to be used for recording a data pattern in a recording-scheduled area portion of a radially inner area (111); a first control means (22) that uses the optimum power to record a data pattern in an area portion radially outer than the recording-scheduled area portion; a second calculating means (22) that takes into account a difference between the recording sensitivity of the recording-scheduled area portion and the recording sensitivity of the area portion radially outer than the recording-scheduled area portion to calculate an adjustment power to be used for adjusting the recording condition in the area portion radially outer than the recording-scheduled area portion; a second control means (22) that records, in the area portion radially outer than the recording-scheduled area portion, a data pattern for adjusting the recording condition by use of the adjustment power; a reading means (12) that acquires a read

Abstract: A distance control circuit (23) keeps constant the distance between a condensing member (11) and the surface of an optical disk (1) using return light from a region where near field light is generated. Under that state, a focus control circuit (27) focus-controls the focus position of the near field light to sustain it at the position of an information layer using reflection light from the information layer. Consequently, information can be recorded and reproduced stably with the near field light without causing erroneous erasure or destruction of information recorded on the information layer (2) even if locally varying irregularities occur on the surface of the optical disk (1) or uneven thickness exists in the protective layer (3).

Abstract: An optical storage apparatus and a method for eliminating a write power transient thereof are provided. The method includes following steps. First, a target voltage level of a write voltage when next time the optical storage apparatus writes data is obtained. Then, a command value is updated by using the target voltage level according to a relationship between the command value and the write voltage. Next, the write voltage of the optical storage apparatus is pre-charged to the target voltage level according to the updated command value. Thereby, the write power transient of the optical storage apparatus can be eliminated.

Abstract: Three phase difference layers having refractive index anisotropy are stacked in parallel and an optic axis angle and retardation of each of the phase difference layers are adjusted and thereby, characteristics having peaks at which ellipticity is approximated to 1 at desired three design wavelengths can be obtained and it can efficiently be adapted to an optical head apparatus for converting linear polarization of a light source with, for example, three different wavelengths into circular polarization.

Abstract: The apparatus comprising a pickup for reading data from or writing data to an optical storage medium, wherein the pickup comprises a laser providing a laser beam, an objective lens for focusing the laser beam onto the optical storage medium, a first detector and a beam splitter arranged between the laser and the objective lens for guiding light reflected from the optical storage medium onto the first detector. A selecting means, arranged in front of the beam splitter, with regard to the reflected light from the optical storage medium, is provided for guiding reflected light passing through an outer section of the objective lens onto a second detector. The light guided onto the first detector is utilized for providing a tracking error signal and the light guided onto the second detector is utilized for providing a data signal.

Abstract: A recording/reproduction apparatus, comprising a first recording section for recording test information onto a medium using at least one recording power, a reproduction section for reproducing at least one test signal indicating the test information from the medium, and a second recording section for recording information onto the medium using one of the at least one recording power. The reproduction section comprises a decoding section for performing maximum likelihood decoding of the at least one test signal and generating at least one binary signal indicating a result of the maximum likelihood decoding, a calculation section for calculating a reliability of the result of the maximum likelihood decoding based on the at least one test signal and the at least one binary signal, and an adjustment section for adjusting a recording power for recording the information onto the medium to the one recording power based on the reliability.

Abstract: According to one aspect, an optical recorder for recording data onto a disc includes a shock detector. The shock detector is used for determining whether the optical recorder is vibrated based on a servo error signal and generating a control signal. The control signal is used for interrupting recording data onto the disc when the optical recorder is vibrated.

Abstract: According to one embodiment, an optical disk device includes a laser light source that emits laser light to be applied to an optical disk, an automatic power control circuit that controls a laser output of the laser light source, and a control processor that performs a setting data transmission process for the automatic power control circuit. The automatic power control circuit includes an operation setting module that makes an operation setting according to setting data obtained in the setting data transmission process of the control processor and a condition determining module that determines whether an operation setting permission condition containing the number of clocks during a transmission period of the setting data is adequate, and inhibits the operation setting of the operation setting module when the operation setting permission condition is not adequate.

Abstract: Drive information is updated to always include the recording/playback conditions determined from the most recent learning process on a data recording medium. The data recording medium has a data recording area for recording data, and a drive information area for recording drive information. The drive information includes a plurality of drive-specific information records. Each of the plural drive-specific information records defines the operating conditions of the data recording and playback apparatus when a data recording and playback apparatus that can load and access the data recording medium reads or writes data. The plural drive-specific information records are arranged chronologically according to when the information was recorded to the data recording medium.

Abstract: A device for recording information on a record carrier (4) has a radiation source and a sensor (33) for generating a sense signal (32), a power control unit (29) for setting the radiation power based on a sampled sense signal, and a sense unit (31) for generating the sampled sense signal. The sense signal is sampled at Ts in periods that are selected on having at least a selected minimum length Lsel in a end part of the selected periods. The sense signal is sampled in the selected control periods for determining a second sample value on a detection time Tdet different from Ts. A difference is determined between the first and the second sample value, and, in dependence on the difference, generating the sampled sense signal is adapted. In particular Lsel may be adapted in dependence on the difference for eliminating remaining effects of a preceding period at a higher power.

Abstract: A multi-channel optical pick-up and a multi-channel optical recording and/or reproducing apparatus employing the same, the multi-channel optical pick-up including: a plurality of light sources including a center light source closest to an optical axis from among the plurality of light sources and at least one off-axis light source farther than the center light source to the optical axis; an objective lens to condense a plurality of light beams respectively emitted from the plurality light sources onto a plurality of tracks of an information storage medium; and an optical path length changing element to compensate for defocus that occurs due to the at least one off-axis light source distanced from the optical axis when a center light beam from the center light source and at least one off-axis light beam from the at least one off-axis light source form spots on the information storage medium.

Abstract: An optical disc apparatus capable of improving an overwrite performance for performing an overwrite operation on a re-writable type optical disc. The apparatus includes a calculating section which calculates out a recording power at the time of previously performing recording in a recording area of the optical disc, and a recording power determining section which determines a write power of the recording power calculated out by the calculating section as a write power of the currently recorded recording power, and at the same time, adjusts erase power, cooling power, and/or middle power of the recording power calculated out by the calculating section to finally determine the currently recorded recording power.

Abstract: An objective lens actuator in an optical pickup, having a semiconductor laser diode, electro-optic parts, such as a lens or the like, as well as, the objective lens actuator, etc., in a case, comprises: a holder, which mounts an objective lens and a coil thereon, as being a movable part; a magnetic circuit part, which is made up with a magnet for magnetically driving said holder and a yoke; a plural number of elastic support parts which elastically supports said holder; and a support part, which supports other ends of said elastic support parts, wherein said support part has a part, which is cut open in parallel with the elastic support parts, between said elastic support parts, and has a through hole, in which said elastic support part passes through for each of said elastic support parts, and thereby to provide the objective lens actuator for lowering the unwanted vibration mode of the objective lens, and also enabling a stable control thereof.