Abstract: A cooling fan and dynamic pressure bearing structure is disclosed. The cooling fan includes a base portion, a bearing portion, a dynamic pressure bearing, a coil assembly, and an impeller assembly. The dynamic pressure bearing is received in the bearing portion. A plurality of pressure collecting grooves is arranged in an inner surface of a shaft hole of the dynamic pressure bearing at intervals for receiving lubricating oil. Each pressure collecting groove has two slanted grooves extending slantways which connect with each other at one end to form a connecting point. A transverse groove extends from the connecting point backward the direction of the two slanted grooves. Based on the special design of the pressure collecting groove, the present invention increases the area that creates pressure to increase the intensity of the pressure and decrease the number of pressure collecting grooves to reduce processing loads and production costs.

Abstract: An optical device. At least one guide bar is connected to a base. A coil is disposed in the base. A central axis of the coil in an optical axis direction of the optical device is parallel to a central axis of the guide bar in the optical axis direction. A lens housing slidably fits on the guide bar. A central axis of the lens housing in the optical axis direction is parallel to that of the guide bar. The lens housing slides along the central axis of the guide bar. A magnetic member is connected to the lens housing opposite the coil, providing a first magnetic field. When the coil is energized to generate a second magnetic field, the lens housing slides on the guide bar by attraction or repulsion of the first and second magnetic fields.

Abstract: An optical device. At least one guide bar is connected to a base. A coil is disposed in the base. A central axis of the coil in an optical axis direction of the optical device is parallel to a central axis of the guide bar in the optical axis direction. A lens housing is slidably fitted on the guide bar. A central axis of the lens housing in the optical axis direction is parallel to that of the guide bar. The lens housing slides along the central axis of the guide bar. A magnetic member is connected to the lens housing opposite the coil, providing a first magnetic field. When the coil is energized to generate a second magnetic field, the lens housing slides on the guide bar by attraction or repulsion of the first and second magnetic fields.

Abstract: An optical device. A guide bar is connected to a base, with a first central axis in an optical axis direction of the optical device. A coil slides on the guide bar and has a second central axis in the optical axis direction and a first central elevation axis. The second central axis is perpendicular to the first central elevation axis. A fixed magnetic member is disposed in the coil and has a central magnetizing axis and a second central elevation axis. The central magnetizing axis is perpendicular to the second central elevation axis and aligned with the second central axis of the coil. The second central elevation axis is separated from the first central elevation axis. A lens housing is connected to the coil. When the coil is energized by application of a current, a magnetic force is generated, moving the coil and lens housing along the guide bar.

Abstract: A fluid dynamic bearing module for cooling fans connects the fixed part and the rotating part of a cooling fan and provides lubrication and support when the rotating part rotates relative to the fixed part. In the design of the invention the fluid dynamic bearing is a module that utilizes a bearing seat, a wear-resistant element and an anti-lift element to make the bearing module leak-proof, lift-proof, wear-resistant and able to create a balance of the lubricant and air.

Abstract: The specification discloses a device and method for manufacturing fluid bearings. The invention utilizes the electromagnetic forming method to manufacturing fluid bearings. The method uses a high speed plastic forming means to produce a dynamic pressure generating groove on the internal peripheral surface of the bearing. It further makes use of different thermal expansion coefficients for an internal mold and a raw sleeve to perform separation from the mold. Through the above-mentioned process, fluid bearings can be successfully made. This method can effectively prevent the problem springback and crease of the material during formation.