Abstract: A printed wiring board includes a plurality of conductor plates that includes at least one conductor plate that is used as a lead for electrical connection with an external circuit, the conductor plates being separated spatially from one another; an insulating layer formed on or across the conductor plates or both on and across the conductor plates; and a plurality of wiring patterns formed on the insulating layer. At least one of the conductor plates is electrically connected with at least one of the wiring patterns through a via-hole.

Abstract: An active sensor 10 is positioned on an outside of a pipe 60 so as to detect a thickness of the pipe. The active sensor comprises: an oscillator 15 capable of inputting oscillatory waves into the pipe and sweeping a frequency of the oscillatory waves within a desired range; and an optical fiber sensor mounted on the pipe, the optical fiber sensor detecting the oscillatory waves generated in the pipe.

Abstract: An active sensor 10 is positioned on an outside of a pipe 60 so as to detect a thickness of the pipe. The active sensor comprises: an oscillator 15 capable of inputting oscillatory waves into the pipe and sweeping a frequency of the oscillatory waves within a desired range; and an optical fiber sensor mounted on the pipe, the optical fiber sensor detecting the oscillatory waves generated in the pipe.

Abstract: A printed wiring board includes a plurality of conductor plates that includes at least one conductor plate that is used as a lead for electrical connection with an external circuit, the conductor plates being separated spatially from one another; an insulating layer formed on or across the conductor plates or both on and across the conductor plates; and a plurality of wiring patterns formed on the insulating layer. At least one of the conductor plates is electrically connected with at least one of the wiring patterns through a via-hole.

Abstract: A printed wiring board includes a plurality of conductor plates that includes at least one conductor plate that is used as a lead for electrical connection with an external circuit, the conductor plates being separated spatially from one another; an insulating layer formed on or across the conductor plates or both on and across the conductor plates; and a plurality of wiring patterns formed on the insulating layer. At least one of the conductor plates is electrically connected with at least one of the wiring patterns through a via-hole.

Abstract: A method for automatically deciding an Internet address of a device newly connected to a network is provided. Addresses of all the other devices connected to the network are collected by receiving and analyzing signals flowing through the network. IP address for the newly connected device is selected in such a manner that it is different from any of the collected addresses. It is checked whether the selected IP address matches with the IP address of any of other device connected to the network. If the selected IP address matches with the IP address of any other device, the selection of the IP address is repeated until the selected IP address does not match with the IP address of any other device.

Abstract: A printed wiring board includes a plurality of conductor plates that includes at least one conductor plate that is used as a lead for electrical connection with an external circuit, the conductor plates being separated spatially from one another; an insulating layer formed on or across the conductor plates or both on and across the conductor plates; and a plurality of wiring patterns formed on the insulating layer. At least one of the conductor plates is electrically connected with at least one of the wiring patterns through a via-hole.

Abstract: A photodiode array device having an absorption layer and a cladding layer formed on one surface of a single substrate, anodes formed on the cladding layer, a cathode formed on the other surface of the substrate, and a plurality of light-receiving regions; a photodiode module including the photodiode array device; and a structure for connecting the photodiode module and an optical connector. The photodiode array device has trenches formed on the one surface of the substrate and having such a depth as to divide the absorption layer into subdivisions, for cutting off propagation of light between adjacent light-receiving regions.

Abstract: A receptacle module capable of suppressing deterioration of characteristics of optical signals transmitted in optical fiber cables even when an external force is applied in a direction orthogonal to a longitudinal direction in a state where an optical fiber connector is attached in a receptacle. The reception module is provided with a receptacle having a first sleeve for holding in a detachable manner an optical fiber connector provided at end of an optical fiber cable, a second sleeve, and a window communicating the first and second sleeves and with an optical module held and fixed in the second sleeve. A projection of the optical module passes over the window to be positioned in the first sleeve and moves a ferrule a bit to press a spring when the connector is inserted in the first sleeve. The ferrule is moved to the right against the pushing force of the spring 21a. The abutting force increases the connection load between the optical fiber cables.

Abstract: A photodiode array device having an absorption layer and a cladding layer formed on one surface of a single substrate, anodes formed on the cladding layer, a cathode formed on the other surface of the substrate, and a plurality of light-receiving regions; a photodiode module including the photodiode array device; and a structure for connecting the photodiode module and an optical connector. The photodiode array device has trenches formed on the one surface of the substrate and having such a depth as to divide the absorption layer into subdivisions, for cutting off propagation of light between adjacent light-receiving regions.

Abstract: A photodiode array device having an absorption layer and a cladding layer formed on one surface of a single substrate, anodes formed on the cladding layer, a cathode formed on the other surface of the substrate, and a plurality of light-receiving regions; a photodiode module including the photodiode array device; and a structure for connecting the photodiode module and an optical connector. The photodiode array device has trenches formed on the one surface of the substrate and having such a depth as to divide the absorption layer into subdivisions, for cutting off propagation of light between adjacent light-receiving regions.

Abstract: A method for automatically deciding an Internet address of a device newly connected to a network is provided. Addresses of all the other devices connected to the network are collected by receiving and analyzing signals flowing through the network. IP address for the newly connected device is selected in such a manner that it is different from any of the collected addresses. It is checked whether the selected IP address matches with the IP address of any of other device connected to the network. If the selected IP address matches with the IP address of any other device, the selection of the IP address is repeated until the selected IP address does not match with the IP address of any other device.

Abstract: A receptacle module capable of suppressing deterioration of characteristics of optical signals transmitted in optical fiber cables even when an external force is applied in a direction orthogonal to a longitudinal direction in a state where an optical fiber connector is attached in a receptacle. The reception module is provided with a receptacle having a first sleeve for holding in a detachable manner an optical fiber connector provided at end of an optical fiber cable, a second sleeve, and a window communicating the first and second sleeves and with an optical module held and fixed in the second sleeve. A projection of the optical module passes over the window to be positioned in the first sleeve and moves a ferrule a bit to press a spring when the connector is inserted in the first sleeve. The ferrule is moved to the right against the pushing force of the spring 21a. The abutting force increases the connection load between the optical fiber cables.