Abstract: A reflective module includes a rotation plate supported by an internal wall of a housing; and a movable holder supported by the rotation plate and including a reflective member. The movable holder moves the reflective member in a first axis direction perpendicular to an optical axis and in a second axis direction perpendicular to the optical axis and the first axis direction. At least two ball members aligned in the first axis direction are disposed in at least one of a first gap between the housing and the rotation plate and a second gap between the rotation plate and the movable holder. A guide groove is disposed in the rotation plate and in at least one of the housing and the movable holder, and the ball members are inserted into the guide grooves. The ball members are inserted into and three-point supported by the guide grooves.

Abstract: A camera module includes a housing; a lens module provided in an internal space of the housing to be movable in an optical axis direction, and including at least one lens therein; a magnet disposed in the lens module; and position detection sensors to detect a position of the magnet. One or more of the position detection sensors are disposed to face a first polarity of the magnet and one or more of the position detection sensors are disposed to face a second polarity of the magnet different than the first polarity.

Abstract: A camera module includes a housing; a plurality of movable lens modules disposed in an internal space of the housing and configured to be movable in an optical axis direction, each of the plurality of movable lens modules comprising at least one lens; and a stopper configured to prevent contact between at least two of the plurality of movable lens modules, wherein the stopper includes a frame mounted on the housing; an extension portion extending from the frame into the internal space of the housing to face a side of one movable lens module of the plurality of movable lens modules in the optical axis direction; and a damping member disposed on the extension portion to face the side of the one movable lens module in the optical axis direction.

Abstract: A camera module includes a housing accommodating a lens module, and an aperture module coupled to an upper portion of the lens module. The aperture module includes a plurality of plates having an incident hole configured to change an amount of light incident on the lens module. At least one of the plurality of plates is configured to be driven by an interaction between a driving magnet provided in the aperture module and a driving coil provided on the housing opposing the driving magnet in a first direction substantially perpendicular to an optical axis direction.

Abstract: A camera module includes: a housing accommodating a lens module; a stop module coupled to a top of the lens module, and including a base including a protrusion fixed to the top of the lens module and extending in a direction of an optical axis of the camera module along an outer side of the lens module, plates disposed on the base and having incident holes configured to change an amount of light incident to the lens module, and a magnet portion movable in a direction perpendicular to the direction of the optical axis with respect to the protrusion and including a driving magnet; and a coil disposed in the housing and configured to interact with the driving magnet to drive the stop module.

Abstract: A camera module includes a housing accommodating a lens module, and an aperture module coupled to an upper portion of the lens module. The aperture module includes a plurality of plates having an incident hole configured to change an amount of light incident on the lens module. At least one of the plurality of plates is configured to be driven by an interaction between a driving magnet provided in the aperture module and a driving coil provided on the housing opposing the driving magnet in a first direction substantially perpendicular to an optical axis direction.

Abstract: A camera module includes: a housing accommodating a lens module; a stop module coupled to a top of the lens module, and including a base including a protrusion fixed to the top of the lens module and extending in a direction of an optical axis of the camera module along an outer side of the lens module, plates disposed on the base and having incident holes configured to change an amount of light incident to the lens module, and a magnet portion movable in a direction perpendicular to the direction of the optical axis with respect to the protrusion and including a driving magnet; and a coil disposed in the housing and configured to interact with the driving magnet to drive the stop module.

Abstract: There are provided a spindle motor including a lower thrust member fixed to a base member; and a shaft fixed to the lower thrust member, wherein the lower thrust member includes a fitting protrusion protruding upwardly in the axial direction and fitted into a fixing groove formed in a lower end of the shaft so as to be depressed upwardly in the axial direction, a thrust bearing surface forming a thrust bearing between the thrust bearing surface and a lower surface of the sleeve, and an extension part protruding from an outer edge of the lower thrust member in a radial direction upwardly in the axial direction to form a liquid-vapor interface between the extension part and an outer surface of the sleeve while enclosing the sleeve, and the thrust bearing surface has inner and outer concave parts depressed in one of inner and outer diameter directions thereof, respectively.

Abstract: There are provided a spindle motor including a lower thrust member fixed to a base member; and a shaft fixed to the lower thrust member, wherein the lower thrust member includes a fitting protrusion protruding upwardly in the axial direction and fitted into a fixing groove formed in a lower end of the shaft so as to be depressed upwardly in the axial direction, a thrust bearing surface forming a thrust bearing between the thrust bearing surface and a lower surface of the sleeve, and an extension part protruding from an outer edge of the lower thrust member in a radial direction upwardly in the axial direction to form a liquid-vapor interface between the extension part and an outer surface of the sleeve while enclosing the sleeve, and the thrust bearing surface has inner and outer concave parts depressed in one of inner and outer diameter directions thereof, respectively.

Abstract: Disclosed are a vibration generator, which can increase the vibration force of a vibration plate by additionally applying the mass of a mass body to the vibration plate, and an electronic device including the same. The vibration generator includes at least one piezoelectric element mounted inside the case and subjected to compression and expansion in response to input power, a vibration plate including a body elongated in a preset lengthwise direction and having the at least one piezoelectric element mounted thereon, and generating vibrations by the compression and expansion of the at least one piezoelectric element, and at least one mass part adding a preset magnitude of mass to the vibration plate.

Abstract: There is provided a lightweight, slim and compact haptic feedback device due to an actuator module constituted of a piezoelectric element and a vibration plate, and an electronic device having the same. The haptic feedback device includes a haptic device receiving contact pressure applied thereto, and an actuator module being in contact with a lower surface of the haptic device and excited according to variations in contact pressure with the haptic device to thereby generate vibrations.

Abstract: There is provided a spindle motor, including: a shaft having a fixing groove formed in a lower portion thereof; a lower thrust member including a fixing part inserted into the fixing groove, a disk part extending from the fixing part in an outer radial direction, and an extension part extending from the disk part in an axial direction; a base member coupled to the extension part; a rotating member forming a bearing clearance with the shaft and rotatably provided with respect to the shaft; a first sealing part provided between an upper surface of the extension part and the rotating member; and a second sealing part provided between an inner circumferential surface of the base member and an outer circumferential surface of the rotating member.

Abstract: There is provided a spindle motor, including: a shaft having a fixing groove formed in a lower portion thereof; a lower thrust member including a fixing part inserted into the fixing groove, a disk part extending from the fixing part in an outer radial direction, and an extension part extending from the disk part in an axial direction; a base member coupled to the extension part; a rotating member forming a bearing clearance with the shaft and rotatably provided with respect to the shaft; a first sealing part provided between an upper surface of the extension part and the rotating member; and a second sealing part provided between an inner circumferential surface of the base member and an outer circumferential surface of the rotating member.

Abstract: A haptic feedback device includes: a haptic device receiving a contact pressure applied thereto; and an actuator provided to the haptic device and excited according to a change in the contact pressure of the haptic device to generate vibrations.

Abstract: There is provided a hydrodynamic bearing apparatus, including: a shaft; and a sleeve rotatably supporting the shaft; wherein at least one of an outer circumferential surface of the shaft and an inner circumferential surface of the sleeve is provided with upper and lower dynamic pressure grooves having a herringbone-shaped pattern provided therein so as to generate fluid dynamic pressure at the time of rotation of the shaft, and at least one of the upper and lower dynamic pressure grooves is formed such that a width of a pattern portion disposed in an upper portion thereof is different from that of a pattern portion disposed in a lower portion thereof, based on a center line.

Abstract: Disclosed herein is a piezoelectric actuator. The piezoelectric actuator includes a piezoelectric element generating vibrations by repetitively expanding and restoring according to power applied from the outside to be linearly driven; a support member contacts the piezoelectric element in order to support the piezoelectric element; and vibration control members attached to one surface of and the support member and the piezoelectric element.

Abstract: Disclosed herein is a piezoelectric actuator module. The piezoelectric actuator module includes a flat plate, two or more elastic members, and a piezoelectric element. The elastic members are provided on each of opposite ends of the plate in a longitudinal direction thereof and protrude perpendicularly from the plate in such a way that a first end of each of the elastic members is coupled to an electronic device. The piezoelectric element is provided on a first surface of the plate and transmits vibrating force to the electronic device. The piezoelectric actuator module includes a plate having on opposite ends thereof two or more elastic members, thus being capable of controlling vibrating force by changing the length of the plate and the number of the elastic members, in addition to reliably supporting piezoelectric elements provided on the plate.

Abstract: A vibration actuator module is disclosed. In accordance with an embodiment of the present invention, the vibration actuator module includes a vibrated body, a vibrating plate, which is coupled to the vibrated body and has a smaller elastic modulus than the vibrated body, and a driver, which is coupled to the vibrating plate.

Abstract: Disclosed herein is a piezoelectric actuator module. The piezoelectric actuator module includes a flat plate. An elastic member is provided on each of opposite ends of the plate in a longitudinal direction thereof, and protrudes perpendicularly from the plate in such a way that a first end of the elastic member is coupled to an electronic device. A plate-shaped elastic body is provided on a first surface of the plate. A piezoelectric element is provided on a first surface of the elastic body. The plate-shaped elastic body is provided between the plate and the piezoelectric element, so that the overall spring constant of the piezoelectric actuator module is lowered and thus the vibrating force of the piezoelectric actuator module is increased.

Abstract: Disclosed herein is a piezoelectric actuator. The piezoelectric actuator includes a piezoelectric element generating vibrations by repetitively expanding and restoring according to power applied from the outside to be linearly driven; a support member contacts the piezoelectric element in order to support the piezoelectric element; and vibration control members attached to one surface of and the support member and the piezoelectric element.