Abstract: An Organic Light-Emitting Diode display substrate and a preparation method thereof. The Organic Light-Emitting Diode display substrate includes: a first flexible organic layer; a first inorganic layer on the first flexible organic layer; a second flexible organic layer on the first inorganic layer; a pixel driving circuit layer on the second flexible organic layer; a light-emitting element layer on the pixel driving circuit layer, and a thickness of the first flexible organic layer is 5 ?m-20 ?m, a thickness of the first inorganic layer is 0.4 ?m-0.5 ?m, and a thickness of the second flexible organic layer is 5 ?m-20 ?m.

Abstract: A display substrate motherboard and a preparation method thereof, a display substrate and a preparation method thereof are disclosed. The display substrate motherboard includes a base substrate, a first flexible organic layer, a first inorganic layer, a second flexible organic layer and a pixel driving circuit layer. The pixel driving circuit layer includes a plurality of pixel driving circuit portions respectively used for a plurality of display substrates, and the plurality of pixel driving circuit portions are insulated from each other. An orthogonal projection of the second flexible organic layer on the base substrate is located inside an orthogonal projection of the first inorganic layer on the base substrate. An orthogonal projection of each of the pixel driving circuit portions on the base substrate is located inside the orthogonal projection of the second flexible organic layer on the base substrate.

Abstract: A display substrate motherboard and a preparation method thereof, a display substrate and a preparation method thereof are disclosed. The display substrate motherboard includes a base substrate, a first flexible organic layer, a first inorganic layer, a second flexible organic layer and a pixel driving circuit layer. The pixel driving circuit layer includes a plurality of pixel driving circuit portions respectively used for a plurality of display substrates, and the plurality of pixel driving circuit portions are insulated from each other. An orthogonal projection of the second flexible organic layer on the base substrate is located inside an orthogonal projection of the first inorganic layer on the base substrate. An orthogonal projection of each of the pixel driving circuit portions on the base substrate is located inside the orthogonal projection of the second flexible organic layer on the base substrate.

Abstract: An exemplary data storage device includes an actuator arm assembly, a top guide rail, a bottom guide rail, and a first ball bearing. The actuator arm assembly includes a first post defining a pivot axis that is inclined between about 5 degrees and about 25 degrees from a horizontal plane defined by a data storage disk surface. The top guide rail includes a first rolling surface that is parallel to the pivot axis. The bottom guide rail is spaced from the top guide rail and includes a second rolling surface that is parallel to the first rolling surface. The first ball bearing includes a first inner race and a first outer race, the first inner race surrounding the first post, and the first outer race in contact with the first rolling surface or the second rolling surface. An exemplary method of assembling a data storage device is also described.

Abstract: A data storage device includes a ferromagnetic center pole, a drive coil for an actuator arm assembly, and a magnetic assembly surrounding the drive coil. The drive coil surrounds the center pole and has a top, a bottom, and first and second sides; the first side is attached to the actuator arm assembly. The magnetic assembly includes a top magnet disposed above and spaced from the center pole, a bottom magnet disposed below and spaced from the center pole, and a side magnet disposed proximate the second side of the coil and spaced from the center pole. In another embodiment, a linear actuator comprises a ferromagnetic center pole, a drive coil supported for linear motion on a rail, and a magnetic assembly. A method including linearly moving a drive coil along a center pole by a magnetic field is also described.

Abstract: An apparatus and associated method for directing windage involves a body defining an aperture. A fastener is operably disposed in the aperture and is selectively engageable with a fixed support member between a first mode permitting rotation of the body around the fastener longitudinal axis, and a second mode affixing the body in place to the support member at a desired rotational orientation. A shroud depends from the body and is sized at a distal end for an operable mating relationship adjacent an arcuate edge of a disc that is rotatable around a disc axis. The shroud distal end is operably disposed a first distance from the fastener longitudinal axis in a direction of a plane including the fastener longitudinal axis and the disc axis. A leading edge of the shroud, with respect to a direction of windage established by disc rotation, is disposed a second distance from the fastener longitudinal axis that is the same or less than the first distance from the fastener longitudinal axis.

Abstract: Apparatus for latching an actuator, such as used in a data storage device. A moveable electrical coil is disposed adjacent a magnetically permeable structure. The coil is latched by magnetic flux passing across a gap extending into the structure which establishes a retention force upon the coil. The coil is subsequently unlatched by application of current to the coil which reduces the magnetic flux across the gap and hence, the magnitude of the retention force upon the coil. The current also concurrently induces movement of the coil away from the gap. The structure preferably comprises a unitary, c-shaped structure comprising a base member, a support member and a pole member, with the coil configured to surround and travel along a lateral extent of the pole member. A permanent magnet is nested on the base member. A plate is preferably coupled to the coil for abutment across the gap.

Abstract: A voice coil motor pole assembly for supporting a latch is disclosed. The pole assembly includes a pin serving as an axle for the latch. The pole assembly also includes a protrusion that extends over a portion of the latch when the latch is mounted on the pin to thereby prevent the latch from being dislodged from the pin.

Abstract: An apparatus restricting motion of an actuator assembly to preclude damage to a read/write head or a disc of a disc drive, the apparatus includes a pole piece with a crash stop mounting aperture and an overmolded crash stop communicating with the crash stop mounting aperture. The overmolded crash stop includes a retention channel formed by a top retention portion, a bottom retention portion and a main body portion during a process of molding the overmolded crash stop to the pole piece. The main body portion conforms to the crash stop mounting aperture, thereby precluding motion of the overmolded crash stop relative to the pole piece in a lateral direction, while the top retention portion and the bottom retention portion constrain motion of the overmolded crash stop relative to the pole piece in the vertical direction.

Abstract: Apparatus for latching an actuator, such as used in a data storage device. A moveable electrical coil is disposed adjacent a magnetically permeable structure. The coil is latched by magnetic flux passing across a gap extending into the structure which establishes a retention force upon the coil. The coil is subsequently unlatched by application of current to the coil which reduces the magnetic flux across the gap and hence, the magnitude of the retention force upon the coil. The current also concurrently induces movement of the coil away from the gap. The structure preferably comprises a unitary, c-shaped structure comprising a base member, a support member and a pole member, with the coil configured to surround and travel along a lateral extent of the pole member. A permanent magnet is nested on the base member. A plate is preferably coupled to the coil for abutment across the gap.

Abstract: An actuator assembly for use in a data storage device comprises an actuator arm and a voice coil motor coil. The actuator arm has a fantail portion and an arm portion offset from the fantail portion. The voice coil motor coil is supported by the fantail portion and is lying partially beneath the arm portion.

Abstract: An apparatus comprising a self-aligning rotatable member arranged between opposing first and second plate members, and a method of installation thereof. The plate members have respective first and second interior sidewalls to define respective first and second apertures therein. The rotatable member includes a central body portion and opposing, axially aligned first and second protrusions sized to rotate within the respective first and second apertures when the central body portion is placed in a gap between the plate members. During installation, the first protrusion of the rotatable member is inserted into the first aperture, and the rotatable member will tend to incur some amount of tilt. As the second plate member is lowered onto the rotatable member, the second interior sidewall contactingly engages a tapered outer surface of the second protrusion, thereby guiding the second protrusion into the second aperture and aligning the rotatable member with the apertures.

Abstract: An apparatus and method of indirectly measuring half frequency whirl in a spindle motor having a rotor adapted to rotate a disc having a track which is followed by a transducer head that is actuated by a control system is provided. Vibration signals produced at the transducer head while the transducer head follows the track are detected. The half frequency whirl is determined as a function of the detected vibration signals.

Abstract: An improved actuator assembly with an out-of-plane voice coil and method of making thereof. The actuator assembly has two substantially planar arms for supporting both read/write devices and the out-of-plane voice coil. The arms are severally formed by stamping processes, and assembled with a pivot mechanism therebetween. The voice coil is affixed to both arms.

Abstract: A voice coil motor pole assembly for supporting a latch is disclosed. The pole assembly includes a pin serving as an axle for the latch. The pole assembly also includes a protrusion that extends over a portion of the latch when the latch is mounted on the pin to thereby prevent the latch from being dislodged from the pin.

Abstract: A latch apparatus for use in a disc drive includes a pivot portion adapted to be rotatably mounted in the disc drive, such that the pivot portion is rotatable between latched and unlatched positions. A latch arm attached to the pivot portion is adapted to restrict movement of an actuator arm when the pivot portion is in the latched position and is adapted to avoid restricting movement of the actuator arm when the pivot portion is in the unlatched position. The latch apparatus also includes a biasing mechanism attached to the pivot portion. The biasing mechanism is adapted to continually bias the pivot portion toward the unlatched position when the pivot portion is mounted in the disc drive. A wind arm attached to the pivot portion is positioned so that a wind produced by spinning the data storage disc pushes against the wind arm and thereby biases the pivot portion toward the unlatched position when the pivot portion is mounted in the disc drive.

Abstract: An apparatus restricting motion of an actuator assembly to preclude damage to a read/write head or a disc of a disc drive, the apparatus includes a pole piece with a crash stop mounting aperture and an overmolded crash stop communicating with the crash stop mounting aperture. The overmolded crash stop includes a retention channel formed by a top retention portion, a bottom retention portion and a main body portion during a process of molding the overmolded crash stop to the pole piece. The main body portion conforms to the crash stop mounting aperture, thereby precluding motion of the overmolded crash stop relative to the pole piece in a lateral direction, while the top retention portion and the bottom retention portion constrain motion of the overmolded crash stop relative to the pole piece in the vertical direction.

Abstract: A voice coil motor suitable for use in devices where space is a significant constraint. The voice coil motor includes one coil portion intersectable with a magnetic field to produce resultant forces and an opposing coil portion shielded from the magnetic field such that the opposing coil portion does not intersect with the magnetic field.

Abstract: A crash stop assembly limits pivotal movement of an actuator assembly mounted on a base plate of a disc drive. The disc drive includes a signal channel extending from the actuator assembly to a disc drive circuit board, and the crash stop assembly includes a connector bracket secured to the base plate and supporting the signal channel. The crash stop assembly further includes a crash stop secured to the connector bracket and extending therefrom, and the crash stop includes a contact surface that contacts the actuator assembly to limit pivotal movement of the actuator assembly.

Abstract: An apparatus and method of indirectly measuring half frequency whirl in a spindle motor having a rotor adapted to rotate a disc having a track which is followed by a transducer head that is actuated by a control system is provided. Vibration signals produced at the transducer head while the transducer head follows the track are detected. The half frequency whirl is determined as a function of the detected vibration signals.