Abstract: A crosslinked positioning method sets one of the intercommunicated positioning devices as a master and the remaining ones as slaves through a crosslink allocation. The method includes the steps of searching several devices at the same time, receiving IDs and comparing the IDs. The device with a higher ID is a master, and the other devices with a lower ID are slaves. The master and slaves perform a data link through a search mode, a call mode, a frequency hopping mode, a transmission power adjusting mode or a correction time mode. After the data link is accomplished, positioning data of the master and the slaves are displayed simultaneously on a screen.

Abstract: A sends and receives advertisement data through wireless LAN. The location based service system includes a plurality of commercial store base stations and at least one client end apparatus operatively connected to the commercial store base stations through the wireless LAN. Therefore, consumer can know the commodity information of the commercial store when he is within an accessible region of the commercial store base station. Moreover, the consumer can know desired commodity information and geographic location of the store with client end apparatus thereof.

Abstract: A many-to-many crosslink communication positioning apparatus includes a CPU, a RF circuit, a GPS circuit, an electronic compass circuit and a display device. Several devices are searched for their serial numbers at the same time, and the serial numbers are compared. The device with a large serial number is a master, and the device with a small serial number is a slave. Data including the search mode, call mode, frequency hopping mode, transmission power adjusting mode and correction time mode of the master and the slave are linked, and then related position and distance of the master and the slave are displayed on a screen of the communication positioning apparatus.

Abstract: A crosslinked positioning method sets one of the intercommunicated positioning devices as a master and the remaining ones as slaves through a crosslink allocation. The method includes the steps of searching several devices at the same time, receiving IDs and comparing the IDs. The device with a higher ID is a master, and the other devices with a lower ID are slaves. The master and slaves perform a data link through a search mode, a call mode, a frequency hopping mode, a transmission power adjusting mode or a correction time mode. After the data link is accomplished, positioning data of the master and the slaves are displayed simultaneously on a screen.

Abstract: The present invention discloses an improved wireless audio output assembly for projectors, which comprises a system unit having a projector circuit therein and a projector lens disposed on the exterior of the system unit, and the system unit has a card-type wireless audio output circuit installed therein and a wireless active speaker installed on the exterior of the system unit, so that a projector can be used as a standalone device without connecting to external cables to read data from a memory card, view video images, and read audio/video signals of an optical disk. The projector can be upgraded to the user's desired wireless audio output circuit by inserting various different cards for the expansion.

Abstract: A bifocal double group lens assembly, sequentially from the object side, comprises: a stationary first lens group with a negative refractive power, a second lens group with a positive refractive power being moveable along optical axis. The second lens group, at two different positions, can focus appropriately on an infinitely distant object when moving along the optical axis. When the lens assembly is in the wide angle mode, and the object to be shot moves from an infinite distance to a near point, the second lens group will move toward the object side for focusing. When the lens assembly is in the Tele mode, and the object to be shot moves from an infinite distance to a near point, the second lens group will move toward the image side for focusing. A linear driver is employed to move the second lens group for executing the function of two-section zoom and continuous focus.

Abstract: The present invention discloses an improved wireless audio output assembly for projectors, which comprises a system unit having a projector circuit therein and a projector lens disposed on the exterior of the system unit, and the system unit has a card-type wireless audio output circuit installed therein and a wireless active speaker installed on the exterior of the system unit, so that a projector can be used as a standalone device without connecting to external cables to read data from a memory card, view video images, and read audio/video signals of an optical disk. The projector can be upgraded to the user's desired wireless audio output circuit by inserting various different cards for the expansion.