Abstract: A link down detector and a link down detecting method for Ethernet are provided. The link down detecting method includes the following steps. Firstly, a received signal is received, and a high-frequency band signal is extracted from the received signal. Consequently, the high-frequency band signal is formed as an extraction signal. Then, a high-frequency band power value of the extraction signal is calculated, and a full band power value of the received signal is calculated. Then, a ratio value of the high-frequency band power value to the full band power value is calculated. In a link up status, if the ratio value is changed dramatically in a specified time, a link down signal is asserted to indicate that a network device connected to the Ethernet is switched to a link down status.

Abstract: A support frame device includes a stationary frame unit that is adapted for supporting two back plates thereon, and a plurality of magnetic units. Each of magnetic units includes a magnetic component connected fixedly to the stationary frame unit, and a magnetic ring. The magnetic ring is adapted to be connected fixedly to a corresponding one of the back plates, surrounds the magnetic component, and is magnetically repulsed from the magnetic component. The back plates are driven by the magnetic rings of the magnetic units to be orderly arranged.

Abstract: A voice coil motor with a surface coil includes a set of magnetic sensing elements, a lens carrier physically connected to the set of magnetic sensing elements, a pedestal, and a set of printed circuit boards fixed onto the pedestal. A patterned metal layer is fabricated on the set of printed circuit boards to form the surface coil, a Hall sensor is installed on one of the printed circuit boards and transmits signals (e.g., operation voltages and feedback sensing signals) via traces fabricated on the set of printed circuit boards, so as to achieve simultaneous fabrication of the surface coil and traces, thereby saving space which is conventionally occupied by copper coils. The Hall sensor can sense a variation in a magnetic field resulting from the motion of the set of magnetic sensing elements to determine a motion status of the lens carrier.

Abstract: A voice coil motor with a surface coil includes a set of magnetic sensing elements, a lens carrier physically connected to the set of magnetic sensing elements, a pedestal, and a set of printed circuit boards fixed onto the pedestal. A patterned metal layer is fabricated on the set of printed circuit boards to form the surface coil, a Hall sensor is installed on one of the printed circuit boards and transmits signals (e.g., operation voltages and feedback sensing signals) via traces fabricated on the set of printed circuit boards, so as to achieve simultaneous fabrication of the surface coil and traces, thereby saving space which is conventionally occupied by copper coils. The Hall sensor can sense a variation in a magnetic field resulting from the motion of the set of magnetic sensing elements to determine a motion status of the lens carrier.

Abstract: A low power voice coil motor (VCM) with a guiding magnet shell comprises a magnetic device, a lens carrier, a base, a plurality of guide posts, an electromagnetic driving apparatus and a shell enclosing the lens carrier, the magnetic device and the electromagnetic driving apparatus. The shell and the magnetic device are arranged with a distance within a predetermined range and the attractive force between the magnetic device and the shell in lateral direction induces a shift of the lens carrier for added the friction force between the plurality of guide posts and walls of a plurality of holes. The added friction force is larger than a gravitational force from a total weight of the magnetic device, the lens carrier and a lens set held by the lens carrier, and/or an upward attractive force of the shell on the magnetic device, so the lens set can be fixed at a position even if power is turned off.