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176results about How to "Simple system configuration" patented technology

Communication system, wireless communication terminal device, position estimation device, communication relay device and connecting station

The present invention discloses a technique, according to which estimation of a position of a mobile wireless device can be accomplished in a simple system configuration by using short distance communication functions. A plurality of standard stations 110 and a plurality of connecting stations 120 are installed within a predetermined area. A mobile wireless device moving within the predetermined area has short distance wireless communication functions and receives a device ID of an opponent device (a correspondent device) each time it intersects another mobile wireless device or a standard station, and stores the device ID as an intersecting history data. When the mobile wireless device moves to a position where it can perform communication to and from a connecting station, which can make access to a position estimation device 150, the stored intersecting history data is uploaded to the position estimation device. The intersecting history data as uploaded from the mobile wireless device is stored in an intersecting history database 155. The position estimation device identifies positions of installation of all standard stations, and it estimates a moving route of the mobile communication device (for which the position is to be estimated) according to the intersecting history data directly uploaded from the mobile wireless device (for which the position is to be estimated) and a moving route of the mobile wireless device (for which the position is to be estimated) is estimated according to the intersecting history with the mobile wireless device (for which the position is to be estimated) as included in the intersecting history data of another mobile wireless device.
Owner:PANASONIC CORP

Surface illumination apparatus and liquid crystal display using same

InactiveUS20110058122A1Simple optical system configurationSelectively illuminate an arbitrary areaOptical light guidesSpectral modifiersLiquid-crystal displayPrincipal plane
A surface illumination apparatus has: a plurality of light sources (12a, 12b) which emit lights; a light guiding plate (15) which allows the lights emitted from the light sources to enter through one of the side faces and emits the lights through one principal plane; a polarizing filter (19) which transmits lights in a predetermined polarizing direction and reflects lights in a polarizing direction perpendicular to the predetermined polarizing direction; a polarizing modulation plate (18) which performs predetermined modulation on the polarizing characteristics of the incident lights; and a reflection sheet (17) which regularly reflects the incident light. The polarizing filter and the polarizing modulation plate are disposed near the one principal plane of the light guiding plate, in order of the polarizing modulation plate and the polarizing filter from the light guiding plate side, the reflection sheet is disposed near the other principal plane of the light guiding plate on the opposite side to the one principal plane, at least two out of the lights emitted from the plurality of light sources include linearly polarized lights of which polarizing directions are perpendicular to each other in a stage of the lights entering the light guiding plate, and the polarizing modulation plate has a polarizing modulation cell (18a) which functions as a ½ wavelength plate, and a non-modulation cell (18b) which does not modulate the polarizing characteristics.
Owner:PANASONIC CORP
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