Abstract: A full color range analog controlled interferometric modulation device is provided. The device includes a transparent substrate, and a transparent fixed-position electrically conductive electrode with a bottom surface overlying the substrate. A transparent spacer overlies the fixed-position electrode, and an induced absorber overlies the spacer. An optically reflective electrically conductive moveable membrane overlies the induced absorber. A cavity is formed between the induced absorber and the moveable membrane having a maximum air gap dimension less than the spacer thickness. In one aspect, the distance from the top surface of the fixed-position electrode to a cavity lower surface is at least twice as great as the cavity maximum air gap dimension. In another aspect, at least one anti-reflective coating (ARC) layer is interposed between the substrate and the fixed-position electrode, and at least one ARC layer is interposed between the fixed-position electrode and the spacer.

Abstract: A microelectromechanical system (MEMS) device is provided. In one embodiment, the MEMS device includes a transparent substrate, and a plurality of interferometric modulators. The plurality of interferometric modulators includes an optical stack coupled to the transparent substrate, in which the optical stack includes a first light absorbing area. The plurality of interferometric modulators further includes a reflective layer over the optical stack, and one or more posts to support the reflective layer. Each of the one or more posts includes a second light absorbing area integrated in the post.

Abstract: A displaying apparatus that includes a plurality of electromechanical system elements arranged in rows. The electromechanical system elements of each of the rows are further arranged in subrows. The subrows of each row are electrically connected. Certain of the electromechanical system elements have a hysteresis stability window that is nested with another hysteresis stability window of certain others of the electromechanical system elements. A method of manufacturing a displaying apparatus that includes forming a plurality of electromechanical system elements arranged in rows. The electromechanical system elements of each of the rows are further arranged in subrows. The subrows of each row are electrically connected. Certain of the electromechanical system elements have a hysteresis stability window that is nested with another hysteresis stability window of certain others of the electromechanical system elements.

Abstract: A front plane laminate useful in the manufacture of electro-optic displays comprises, in order, a light-transmissive electrically-conductive layer, a layer of an electro-optic medium in electrical contact with the electrically-conductive layer, an adhesive layer and a release sheet. This front plane laminate can be prepared as a continuous web, cut to size, the release sheet removed and the laminate laminated to a backplane to form a display. Methods for providing conductive vias through the electro-optic medium and for testing the front plane laminate are also described.

Abstract: There is provided a charged particle migration-type display panel (1) which has a plurality of cells (40) partitioned by partitions (31) between a transparent substrate (10) and a back substrate (20) placed opposite to each other, and charged particles (41, 42) sealed in the respective cells (40), and in which the partitions (31) provided upright on the back substrate (20) are formed of a translucent material, and the tips and the side faces of the partitions (31) are covered with a resin (32) containing an opaque or semi-transparent dark-colored coloring material, thereby forming a black matrix structure.

Abstract: A laser scanning beam reader is provided. When a round-grating-dot matrix is in a stationary state, the laser beams passing through the round-grating-dot matrix result in line-shaped refraction beams. By the laser scanning beam reader, the motor system conventionally used for rotating the hologram disc to successively generate dot scanning beams as the line-shaped will be omitted. As a consequence, the components and configurations of the laser scanning beam reader are simplified and the cost thereof is reduced.

Abstract: A device comprising a conversion channel including: a first end configured to accept ambient electromagnetic radiation, the ambient electromagnetic radiation having an initial frequency, a second end configured to allow the ambient electromagnetic radiation to exit, and at least two opposing walls connecting the first end and the second end, wherein the at least two opposing walls include one or more crystals, the at least two opposing walls being separated by at least one-half of a wave length; wherein when the ambient electromagnetic radiation interacts with the one or more crystals of the at least two opposing side walls, the initial frequency of the ambient electromagnetic radiation being repeatedly increased to an optimal frequency is provided.

Abstract: The present invention relates generally to devices for the generation and amplification of electromagnetic energy. The present invention relates more particularly to optical fiber devices, such as lasers and amplifiers, useful for generating and amplifying optical energy.

Abstract: In a first aspect, a method of fabricating an EUV light source mirror is disclosed which may comprise the acts/steps of providing a plurality of discrete substrates; coating each substrate with a respective multilayer coating; securing the coated substrates in an arrangement wherein each coated substrate is oriented to a common focal point; and thereafter polishing at least one of the multilayer coatings. In another aspect, an optic for use with EUV light is disclosed which may comprise a substrate; a smoothing layer selected from the group of materials consisting of Si, C, Si3N4, B4C, SiC and Cr, the smoothing layer material being deposited using highly energetic deposition conditions and a multilayer dielectric coating. In another aspect, a corrosion resistant, multilayer coating for an EUV mirror may comprise alternating layers of Si and a compound material having nitrogen and a 5th period transition metal.

Abstract: Embodiments of the present invention relate to a surface wave enabled darkfield aperture structure comprising an aperture layer, a aperture in the aperture layer and a plurality of grooves around the aperture. The aperture layer has a first and second surface. The plurality of grooves is in the first surface. A surface wave propagates along at least the first surface. The plurality of grooves is configured to generate a darkfield at the aperture by modifying the surface wave to cancel out direct transmission of a uniform incident light field received by the aperture.

Abstract: In accordance with one embodiment of the present invention an apparatus for a low numerical aperture exclusion imaging apparatus is provided. The apparatus may include an electromagnetic illumination source for illuminating a portion of a specimen, and for collecting an image created by the electromagnetic radiation an objective lens optically coupled to the electromagnetic illuminated portion of the specimen. The apparatus also includes an optical blocking plate disposed between the objective lens and a focusing lens. The optical blocking plate is positioned to substantially block undesired electromagnetic radiation from image sources distally aligned in the same optical axis as the specimen. This invention enhances narrow depth of field characteristics in imaging. It also enhances discreet imaging in a narrow focus field by eliminating some of most of the light which contributes to wide depth of field focus. This is useful for optical sectioning ranging from microscopy to photography.

Abstract: An autostereoscopic display lens arrangement comprises an array (9) of parallel lenticular lenses (11), wherein the lens array comprises first and second materials of different refractive indices (60,62) sandwiched between planar substrates, with the interface between the first and second materials defining the lens surfaces. The first material has a refractive index n1, the lens array has a lens pitch p and the lenticular lenses have a radius of curvature at their centre of R, and the lenses satisfy n1 (p/2R)>0.6. This arrangement gives reduced banding and loss of intensity at steep angles when used in an autostereoscopic display.

Abstract: An exemplary display is placed in an optical pathway extending from an entrance pupil of a person's eye to a real-world scene beyond the eye. The display includes at least one 2-D added-image source that is addressable to produce a light pattern corresponding to a virtual object. The source is situated to direct the light pattern toward the person's eye to superimpose the virtual object on an image of the real-world scene as perceived by the eye via the optical pathway. An active-optical element is situated between the eye and the added-image source at a location that is optically conjugate to the entrance pupil and at which the active-optical element forms an intermediate image of the light pattern from the added-image source. The active-optical element has variable optical power and is addressable to change its optical power to produce a corresponding change in perceived distance at which the intermediate image is formed, as an added image to the real-world scene, relative to the eye.

Abstract: A light control film including a polymer carrier film and a coating disposed on the carrier film and including dark colored or reflective particles dispersed within a cured resin matrix, the particles being aligned either perpendicular or parallel to a major surface of the carrier film, and method for making the same.

Abstract: Apparatus for projecting a pattern includes a first diffractive optical element (DOE) configured to diffract an input beam so as to generate a first diffraction pattern on a first region of a surface, the first diffraction pattern including a zero order beam. A second DOE is configured to diffract the zero order beam so as to generate a second diffraction pattern on a second region of the surface such that the first and the second regions together at least partially cover the surface.

Abstract: In a grating device (1), a plurality of projections (3) that extend in a predetermined direction and projections (4) that extend in a direction substantially perpendicular to the predetermined direction on both sides of the projections (3) in the predetermined direction and that are connected to the end portions of the projections (3) are formed on the surface (2a) of a substrate (2). Thus, since the projections (3) are highly reinforced by the projections (4), it is possible to prevent the projections (3) of a grating portion (6) from being damaged. Moreover, since the surface (5a) of a substrate (5) is joined to the top portions (3a) and (4a) of the projections (3) and (4), it is possible to prevent the intrusion of particles into the area between the projections (3).

Abstract: A hard coating film is provided and includes a transparent plastic substrate film, and a hard coating layer. The transparent plastic substrate film has mutually independent microscopic pits in at least one surface thereof, the microscopic pits each independently have a depth of 3 ?m or below, the microscopic pits have an average length of major diameters of from 0.5 ?m to 20 ?m, and the number of the microscopic pits is from 25 to 3,000 per mm2.

Abstract: Asymmetric light diffuser and the methods for manufacturing the same are provided. The diffuser is preferably a transparent film made by a stress-stretch process. Particularly, a substrate doped with variant beads is formed as an anisotropic film layer after the stress-stretch process, so that the characteristics with birefringence and diffusion are incorporated. Further the asymmetric relief structure is formed on the surface of substrate by means of extrusion or co-extrusion process. A uniform light and anisotropic refraction can be formed through the diffuser, and even the partial polarization scattering can be formed due to the asymmetric refraction. The preferred embodiment of the diffuser includes a first step of preparing the mold for forming the basic surface structure of the asymmetric diffuser. Further, the substrate with surface micro-structure is formed by a roll-to-roll process. After that, the inside variant refractions and structure deformation are formed under the stress-stretch process.

Abstract: There is provided an optical limiter device for protecting an object from incident light having a wavelength in the visible, infrared or ultraviolet spectrum. The device comprises a plurality of nanoparticles of a metallic material including free electrons that undergo collective oscillations when exposed to the incident light. The plurality of nanoparticles of the metallic material include a plurality of nanoparticles of a non-spherical particle geometry, which may include a geometry having a plurality of sharp protrusions on a spherical body. The metallic material may include gold, silver, aluminum, indium or copper. The device further comprises a structurally rigid transparent medium in which the plurality of nanoparticles of the metallic material are embedded; and a mechanical support mounting the transparent medium between the incident light and the object.

Abstract: A high SAG optical lens and method for fast molding the same is disclosed, in which an optical lens is a single optical lens or an optical lens array formed by placing optical material between an upper mold and a lower mold for molding by heating and pressing processes; a formed rim is molded at the joint of the optical surface and the lens flange simultaneously. Therefore, it is convenient to fabricate the optical lens with high SAG and can eliminate the ghost phenomena effect occurring at the edge of the optical surface and the lens flange. Furthermore, since the feature of squeezing the melted optical material by the formed rim during the molding process, fast molding process can be successfully achieved.

Abstract: A laser eye protection (LEP) system for a helmet having a helmet-mounted display (HMD) system. The LEP system includes a large outer visor, which provides ballistic protection, LEP and a display surface for the HMD, and a smaller inner visor, which also provides LEP. LEP is split between the two visors, so that the outer visor can block light in a wavelength that overlaps with the peak wavelength range of the HMD without impairing the wearer's ability to view HMD imagery. The outer visor also preferably does not block near IR light, which allows image-enhancement devices to be positioned within the protective envelope of the outer visor while the smaller inner visor protects the wearer from near IR threats.

Abstract: In a half mirror of a head mounted display which is formed by stacking a dielectric film and a metal film to a plate-shaped resin member, reflectivity of a P-polarized light and reflectivity of an S-polarized light do not agree with each other in at least a partial band of a visible band which contains wavelengths of three primary colors which constitute the image light. On the other hand, the reflectivity of the P-polarized light and the reflectivity of the S-polarized light with respect to the three primary colors are set approximately equal. An average value of transmittance of the P-polarized light and transmittance of the S-polarized light with respect to the respective wavelengths in the visible band which contains the wavelengths of the three primary colors is suppressed to a value which falls within a regulated range in the whole visible band.

Abstract: A display device includes: a display part containing a first display region visually recognized by a viewer; an object of view arranged in a second display region; an imaging optical system of real specular image for defining a first space in which the first display region exists and a second space in which the second display region exists, the imaging optical system of real specular image including a semitransparent substrate with a plane of symmetry, the imaging optical system of real specular image forming a real image of the object of view in the first space of the first display region with light passing through the substrate; and a half mirror arranged in the first space of the first display region, the half mirror reflecting light beams emitted from the imaging optical system of real specular image to guide the reflected light beams to the viewer, while allowing an image formed in the first display region to be seen by the viewer.

Abstract: An optical element Ggi1 includes a medium that has a refractive index distribution. This optical element satisfies conditions of |?F(pmax)??gF(pmin)|?0.02, |??gFgi(p1)|?0.0272, ??gdgi(p1)|?0.0250, and |?gFgi(pmaxgi)??gFgi(pmingi)|?0.1.

Abstract: A front projection display device includes an optical engine including an illumination system, an imaging system, and projection optics. The projection optics include a first lens group of negative refractive power that has at least one aspheric surface. The projection optics output an image at a half field angle of at least 45°, where the image has substantially no distortion. For example, when the first lens group is placed at a distance of less than 1 meter from a viewing screen, the output image has a size of about 40 inches diagonal or greater, and requires substantially no keystone correction. In other aspects, the optical engine can be implemented in a wall-mounted projection system, a multimedia system, a compact integrated monitor system, and a portable projection unit.

Abstract: The invention relates to an electronic image pickup system whose depth dimension is extremely reduced, taking advantage of an optical system type that can overcome conditions imposed on the movement, of a zooming movable lens group while high specifications and performance are kept. The electronic image pickup system comprises an optical path-bending zoom optical system comprising, in order from its object side, a 1-1st lens group G1-1 comprising a negative lens group and a reflecting optical element P for bending an optical path, a 1-2nd lens group G1-2 comprising one positive lens and a second lens group G2 having positive refracting power. For zooming from the wide-angle end to the telephoto end, the second lens group G2 moves only toward the object side. The electronic image pickup system also comprises an electronic image pickup device I located on the image side of the zoom optical system.

Abstract: This invention provides an imaging lens assembly comprising: in order from an object side to an image side: a first lens with positive refractive power having a convex object-side surface and a convex image-side surface; a second lens with negative refractive power having a concave object-side surface; a third lens with positive refractive power having a convex image-side surface, at least one of both surfaces thereof being aspheric; and a fourth lens with negative refractive power having a convex object-side surface and a concave image-side surface on which at least one inflection point is formed; wherein there are four lenses with refractive power, an on-axis spacing between an aperture stop and an electronic sensor provided therein is SL, an on-axis spacing between the object-side surface of the first lens and the electronic sensor is TTL, they satisfy the relation: 0.75<SL/TTL<0.90.

Abstract: A lens system, in order from the object, includes positive first lens, negative second lens, positive third lens, positive fourth lens, and an aperture stop positioned between the third and fourth lens. The second lens includes a first optical portion, a first support portion surrounding the first optical portion with a first surface and second surface. The third lens includes a second optical portion and a second support portion surrounding the second optical portion with a third surface and fourth surface. The fourth lens includes a light stop surface facing the object side of the lens system. The lens system satisfies the formulas: d23<1.1×d34, where the d23 is a distance along the optical axis of the lens system from the second surface to the third surface, and the d34 is a distance along the optical axis from the fourth surface to the light stop surface.

Abstract: In an optical system for observing a front object and an approximately lateral object, a front group having a reflective refractive optical element and negative refractive power, an aperture stop, and a rear group having a moving lens group and positive refractive power are arranged in order from the front-object side, where the moving lens group moves in the direction along the optical axis, the reflective refractive optical element includes a first surface which has a first transmitting surface and a first reflective surface and is formed on the front-object side, where the first transmitting surface is formed with the center of the first transmitting surface on the optical axis and the first reflective surface is formed in the shape of a ring and around the first transmitting surface and faces toward the image side, a second surface which has a second transmitting surface and a second reflective surface and is formed on the image side, where the second transmitting surface is formed with the center of the

Abstract: The present application relates to an insert (18) for holding an optical system (90, 92), in particular a focusing optics, in a laser machining head (10) for machining a workpiece with a laser beam, it being possible to displace the optical system (90, 92) relative to the insert (18) via adjusting means, characterized in that the adjusting means for displacing the optical system (90, 92) in the longitudinal direction of the laser beam comprises a linear adjusting device (64, 66, 68) with a synchronous linear motor (68) as well as to a laser machining head (10) for machining a workpiece by means of a laser beam, having a housing (14) in which the insert (18) according to one of the preceding claims can be introduced laterally.

Abstract: A lens drive control device for a lens barrel, which controls at least a part of a plurality of lens groups respectively including at least one lens, wherein a state of the lens barrel transits from a retracted state to a photographing extended state, the lens drive control device comprising: a detection device which detects that the at least one lens group reaches a reference position, and a determination device which determines an abnormal actuation based upon a detection by the detection device, upon actuation when the at least one lens group is moved from the retracted position to the position on the optical axis, wherein the determination device determines that the actuation is abnormal when the detection device detects that the at least one lens group reaches the reference position for a plurality of times.

Abstract: A lenses assembly includes a first lens, a second lens, and adhesive material. The first lens includes two axially extending protrusions. The second lens includes two radially extending protrusions. The second lens engages with the first lens by engagement between the axially extending protrusions and radially extending protrusions. The axially extending protrusions and radially extending protrusions are alternately arranged around a circumferential direction of the first lens. The adhesive material is filled into gaps between the engaged protrusions to fixedly interconnect the first lens and the second lens.

Abstract: An exemplary camera module includes a barrel and a holder. The barrel includes a first threaded part and a first cylindrical part connected to the first threaded part in an order from an object side to an image side. The first threaded part includes a plurality of external threads. The holder includes a second threaded part and a second cylindrical part connected to the second threaded part in an order from the object side to the image side. The second threaded part includes a plurality of internal threads. The barrel is coupled to the holder via the internal threads and the external threads. The inner cylindrical surface of the second cylindrical part is in contact with the outer cylindrical surface of the first cylindrical part.

Abstract: A lens barrel includes a fourth lens, a prism, and a sixth lens. The fourth lens receives a light flux incident along a first optical axis. The prism includes a reflecting surface reflecting the light flux passing through the fourth lens to a direction along a second optical axis intersecting with the first optical axis. The sixth lens receives the light flux reflected by the prism. A second group frame includes an opening portion, a prism retaining frame that is arranged in a more inner position than the opening portion and in which the prism is contained, and a plurality of adhesive pockets arranged on an area around the prism retaining frame and being open to the side of the opening portion. Adhesive agent is filled in the adhesive pockets.

Abstract: A device for the temperature-dependent axial movement of an optical component including a monolithic mounting unit having an outer mounting part forming a fixed holder having an axis and an inner mounting part forming a mount adapted to support the optical component. The mount is movable along the axis. A moving mechanism is connected to the fixed holder and the movable mount. The moving mechanism includes at least one external expansion element including a first material having a first coefficient of thermal expansion and at least one internal expansion element including a second material having a second coefficient of thermal expansion, where the first coefficient of thermal expansion is larger than the second coefficient of thermal expansion. A number of connecting links is disposed in a star-shaped formation and join a respective one of the at least one external expansion element to a respective one of the internal expansion element.

Abstract: An exemplary piezoelectric driving module includes a movable barrel, a fixed barrel receiving the movable barrel, a piezoelectric actuator, and a spring member. The piezoelectric actuator is configured for moving the movable barrel relative to the fixed barrel. The piezoelectric actuator includes a piezoelectric body mounted on the sidewall of the fixed barrel and a friction member mounted on the piezoelectric body. The piezoelectric body is configured for driving the friction member to generate elliptical vibration. The friction member is in frictional contact with the movable barrel. The spring member connects the movable barrel to the fixed barrel. The spring member is configured for providing an resilient force to make the movable barrel be in frictional contact with the friction member such that the friction member can be driven by the piezoelectric body to move the movable barrel along the central axis of the fixed barrel.

Abstract: An autofocus lens module includes a holder defining a space, a barrel positioned in the space of the holder, a first post extended from an outer surface of the barrel, a first spring connecting adjacent ends of the barrel and the holder such that the barrel is maintained in the holder, and a first piezoelectric actuator. The first piezoelectric actuator is fixed on an internal surface of the holder and capable of deforming along a central axis of the holder. The first piezoelectric actuator is coupled with the first post so as to move the barrel along the central axis of the holder.

Abstract: A deformable mirror device includes: a flexible member having a mirror surface on a front surface and a convex cross-sectional shape pattern on a rear surface, the cross-sectional shape pattern having a protrusion at a pressing reference point and having the largest cross-sectional thickness, the flexible member further having a convex frame on the rear surface but outside a deformable region where the cross-sectional shape pattern is formed; a housing having a guide hole in a front surface of the housing, and an internal hole communicating with the guide hole, the frame of the flexible member positioned such that the center of the opening coincides with the pressing reference point and fixed to the front surface; a driving force transmitter having a column having a spherical tip, the column inserted into the guide hole so that the spherical tip comes into contact with the protrusion at the pressing reference point; and a driving force generator provided in the internal hole, one end of which bonded to an end

Abstract: A multi-curvature convex mirror is comprised of a first reflective surface having a first curvature and defined by a portion of the surface area of a greater sphere and a second reflective surface having a second curvature greater than the first curvature and defined by a portion of the surface area of a lesser sphere that intersects the surface area of the greater sphere. The primary and secondary reflective surfaces are comprised of a series of locations, each defined by an x, y, and z coordinate, determined in accordance with the relationship z = x a + y b where 600?a?1,300 and 100?|b?a|?200.

Abstract: This device uses mirrors and the optical effect of parallax to create the optical illusion of an infinite regression of reflections in those mirrors. Mirrors are attached, facing inwards, to the four inner sides of a box, and a mirror is attached to the bottom facing upwards. Mirrors that reflect on one side but can be seen through when looking from the other side are generally known as “see through” or “one way” mirrors. The front side of the box has viewing portals and a one way “see through” mirror through which the viewer can look directly from outside the box into the line of sight for the reflections inside the box without the viewer's reflection showing in the mirrors. Thus, the viewer sees a nearly infinite chain of reflections in the mirrors because of the optical effect of parallax and because the viewer's reflection is in spite of the fact that the viewer is looking directly into a mirror because the viewer's reflection is hidden by the “one way” see through mirror in the front.

Abstract: The invention provides a part of the mirror housings or cover that has a designed-in-flexibility to move versus other cover parts and to move back to the working position without distortions.

Abstract: Track pitch in a hard disk drive is selected to satisfy the requirements of both off-track capacity (OTC) and adjacent track interference (ATI). The invention separately measures the track pitch requirements for OTC and ATI. The track pitch for the drive is set with the larger of the OTC and ATI track pitches. The OTC track pitch is measured with a 747 curve, and the ATI track pitch is measured by the positions of adjacent tracks at which the on-track error rate is not worse than a given value after the targeted number of adjacent track writes in the ATI requirement.

Abstract: A system for decoding data includes a symbol based error correction code device. The error correction code device includes a channel detector configured to generate probability mass function (PMF) information. The error correction code device further includes a decoder coupled to the channel detector. The decoder is configured to use the PMF information from the channel detector to perform an error correction code operation. The decoder also is configured to generate PMF information. The channel detector is configured to receive extrinsic PMF information in a turbo equalization scheme.

Abstract: A novel magnetic recording medium is disclosed in which a plurality of magnetic data recording layers and navigation layers are separate from one another. By decoupling the navigation and data layers, data may be written to data layers without the need to align the written data along servo tracks. Thus, the data layers may be configured for high recording density. Beneficially, imperfections within the magnetic data layers may also be compensated for by the use of adaptive error correction schemes which vary the encoding/decoding of data during writing/reading based upon the local quality of the recording media.

Abstract: A method and apparatus for reducing noise in a communication signal is provided. The method includes converting raw channel data from the communication signal to a sequence of transition code symbols, each symbol having a plurality of bits, each bit having a position within the symbol. The method also includes sending the bits of each symbol to a plurality of bins, each bin corresponding to the position of each bit within the symbol. For each bin having a number of transitions greater than a number of non-transitions, the method also includes flipping every bit in the bin and setting a corresponding bit in a flip control word to a first value. The method still further includes binary adding the flip control word to each transition code symbol.

Abstract: Embodiments of the invention broadly contemplate systems, methods and arrangements for managing Adjacent Track Interference (ATI) risk through intelligent management of a table that logs individual tracks creating a risk of ATI in tracks adjacent thereto. Embodiments of the invention provide that tracks considered being at low risk for creating ATI be ejected from the table in order to maintain a track-level log of manageable size.

Abstract: A disk drive comprises a disk, and a head for reading and writing data on the disk. The disk drive detects head-disk interference (HDI) during a write operation by measuring a parameter during the write operation and comparing the measured parameter against a reference parameter. The reference parameter is measured while the disk drive generates HDI under a set of reference conditions. In various embodiments, the reference parameter comprises attributes of a position error signal, a servo automatic gain control, a jitter representing a difference between a current velocity and a target velocity of a spindle motor, and a bias applied to a voice coil motor.

Abstract: Data is written to a hard disk drive using shingled writing principles, i.e., each data track is partially overwritten when an immediately contiguous data track is written. One or more contiguous data tracks establish a hand, and a band establishes a respective segment in a log-structured file system.

Abstract: A guide for guiding a magnetic data storage tape has a curved support portion for supporting a major tape surface and at least one flange adjoining the support portion. At least in a region of transition between the support portion and the at least one flange, the guide has an under coating of a diamond like carbon material, tungsten carbide, or similarly wear resistant material, and a surface coating having lower surface tension than the under coating. A tape guide apparatus and a method of making a tape guide are also disclosed.

Abstract: According to one embodiment, a magnetic head for perpendicular recording includes a slider includes a facing surface, and a head section on the slider. The head section includes a main pole, a recording coil configured to excite the main pole, a write/shield pole opposed to a trailing side of the main pole across a write gap, and side shields disposed individually on opposite sides of the main pole transversely relative to a track to face side faces of the main pole and magnetically separated from the main pole. That part of a side face of each of the side shields opposed to each corresponding side face of the main pole which is located at the shortest distance from a leading end of each of the side faces of the main pole, on the facing surface, includes a permeability lower than that of the other part of the side shield.