Abstract: In a battery pack (1), control means (3) reads identification information or operating state detection information out of identification information memory means (4) or battery operating state detection means (10) and inputs it to a modulation circuit (5). The modulation circuit (5) modulates the information into an information signal which can be superimposed on a direct-current power transmission line and sends it to a charging device (20) or a loading device (30) through a positive charge and discharge terminal (11). The charging device (20) or the loading device (30) demodulates the sent information signal to take out the identification information or the operating state detection information and allows power source control means (25, 35) to control the output of charging energy from a charging power source (23) or the output of discharging energy to a load (33).

Abstract: In a battery pack (1), control means (3) reads identification information or operating state detection information out of identification information memory means (4) or battery operating state detection means (10) and inputs it to a modulation circuit (5). The modulation circuit (5) modulates the information into an information signal which can be superimposed on a direct-current power transmission line and sends it to a charging device (20) or a loading device (30) through a positive charge and discharge terminal (11). The charging device (20) or the loading device (30) demodulates the sent information signal to take out the identification information or the operating state detection information and allows power source control means (25, 35) to control the output of charging energy from a charging power source (23) or the output of discharging energy to a load (33).

Abstract: An assembly comprising a plastic optical fiber socket attachable to three modules in accordance with JIS standards and a plug; the plastic optical fiber socket including a body having a plug inlet port, a port cover mounted to the body so as to be automatically openable, a receptacle mounted to the body for connection with a plastic optical fiber cable, and a tensile retainer engaged with the body for retaining the plastic optical fiber cable; and the plug including a housing, an engagement portion fixed to the housing for engagement with the receptacle, and a beam formed on the housing, the beam made of elastic material or having an elastic structure.

Abstract: A battery pack (2) having a reduced number of an inspection terminal (18) for inspecting operations of a battery protection circuit (11) for the battery pack (2), and an inspection device (1) for inspecting the operations of the battery protection circuit (11) for the battery pack (2) are provided. A voltage difference between an output voltage of a battery voltage memory circuit (41) for storing the voltage of a rechargeable battery (12), and an output voltage of a DC voltage power supply (42) is added to a voltage between a positive electrode input/output terminal (16) and a negative electrode input/output terminal (17), and the added voltage is provided for a control circuit (13) as an inspection voltage.

Abstract: An assembly comprising a plastic optical fiber socket attachable to three modules in accordance with JIS standards and a plug; the plastic optical fiber socket including a body having a plug inlet port, a port cover mounted to the body so as to be automatically openable, a receptacle mounted to the body for connection with a plastic optical fiber cable, and a tensile retainer engaged with the body for retaining the plastic optical fiber cable; and the plug including a housing, an engagement portion fixed to the housing for engagement with the receptacle, and a beam formed on the housing, the beam made of elastic material or having an elastic structure.

Abstract: A battery pack (2) having a reduced number of an inspection terminal (18) for inspecting operations of a battery protection circuit (11) for the battery pack (2), and an inspection device (1) for inspecting the operations of the battery protection circuit (11) for the battery pack (2) are provided. A voltage difference between an output voltage of a battery voltage memory circuit (41) for storing the voltage of a rechargeable battery (12), and an output voltage of a DC voltage power supply (42) is added to a voltage between a positive electrode input/output terminal (16) and a negative electrode input/output terminal (17), and the added voltage is provided for a control circuit (13) as an inspection voltage.