摘要:
An electronic ballast A includes an inverter circuit for converting a DC voltage into a high-frequency voltage, a resonant circuit which is connected between outputs of the inverter circuit and lights a discharge lamp at a high frequency by a resonant action, a dimming circuit for changing an output voltage to the discharge lamp by changing an operating frequency of the inverter circuit, a DC component detecting circuit for detecting a DC voltage component of the discharge lamp and a control operating circuit which detects an output signal of the DC component detecting circuit for every predetermined period to reduce or stop an output to the discharge lamp in the case where the output signal exceeds a predetermined reference value and to prohibit the protection operation when periodic change amount in the output signal reaches a predetermined value or higher.
摘要:
An information distribution apparatus for a CATV system which apparatus is capable of transmitting an identical program directed to a plurality of set-top boxes with the use of a single communication path between a distribution control section and an information distributing section. When distribution of identical information is requested from a plurality of set-top boxes, path identification number decision unit determines an identification number of a single communication path for these set-top boxes. Distribution information transmitting unit transmits the requested distribution information to the information distributing section via the communication path with the thus-determined identification number. In the information distributing section, set-top box identifying unit identifies individual set-top boxes to which the distribution information is to be distributed, based on the identification number of the communication path used for transmission by the distribution information transmitting unit. Distribution information distributing unit distributes the distribution information to each of the identified set-top boxes.
摘要:
In an access network system for performing a maintenance management of an access line, a processor stores an allocation status of a bearer channel to be managed, and a system manager determines an availability status of the access line based on the allocation status. Also, the processor determines the availability status based on the allocation status and loop open/close information of a PSTN/ISDN user line. Furthermore, the system manager 25 activates a test portion based on the availability status.
摘要:
A method of manufacturing a shoe including cutting a columnar raw material to a given length to provide a disc-shaped raw material, forming on one end face of the disc-shaped raw material a spherical sliding surface which is to be disposed in sliding contact with a spherical surface on a piston, and forming a thermal sprayed layer on the other end face of the disc-shaped raw material. The thermal sprayed layer serves as a flat plate-shaped sliding surface which is to be disposed in sliding contact with a swash plate. A shoe which is provided with the thermal sprayed layer exhibits an increased seizure resistance in comparison to a conventional shoe which is formed with a sintered layer, and can be manufactured inexpensively.
摘要:
A stent having a cylindrical shape includes frame-like unexpandable portions incapable of being expanded in a circumferential direction, and frame-like expandable portions capable of being expanded in the circumferential direction. The unexpandable portions and the expandable portions are alternately connected together in the circumferential direction.
摘要:
A telephone system comprises a multi-channel transmission apparatus for connecting a subscriber line to a telephone exchanger, where the transmission apparatus comprises: a subscriber interface for interfacing said subscriber line; a detecting circuit in the subscriber interface for detecting a change in a voltage on the subscriber line; and a discriminating circuit for discriminating whether the change detected by the detecting circuit is continuous or intermittent, upon discriminating the detected change in voltage as intermittent the discriminating circuit outputs a first alarm signal. The discriminating circuit may be formed of a software counter which counts a number of the intermittent signals for a predetermined period. The software counter does not require a bulky and expensive components, such as a 60 Hz filter. If the counted number is larger than a predetermined number the signal is determined to be intermittent. The first alarm signal may start a subscriber line tester which includes an AC voltage tester to measure an AC voltage on the subscriber line. If the measured AC voltage exceeds a predetermined criterion, it is determined that a power exposure has happened. This method allows a quick and correct detection of power exposure by merely adding a program into a currently provided micro processor, without requiring additional component.
摘要:
A system for controlling an ignition device for a a motor vehicle comprises a key operated movable member, a blocking mechanism for automatically blocking the key operated movable member against return movement once the key operated movable member has moved beyond a predetermined position, and means responsive to a predetermined condition of the vehicle for restraining a manual release member of the blocking mechanism from actuation for releasing the blocking mechanism.
摘要:
A magnetic circuit, provided with a short magnet and short magnet that are arranged in an array, and a yoke and a yoke provided so as to sandwich the short magnet and short magnet. The short magnet and short magnet, are arranged, that have a space between them that is a predetermined gap or less in the arrangement direction of the array respectively. In addition, the short magnet and short magnet are arranged so that one magnetic pole is located on the side toward one of the pair of yokes and, and the other magnetic pole is located on the side toward the other yoke.
摘要:
A light source device includes: a rod-shaped light source or an array light source extending in a main scanning direction; a reflector that is placed opposite the rod-shaped light source or the array light source, extends in the main scanning direction, and reflects light output from a side face of the rod-shaped light source or the array light source; and a plurality of reflector supports that are arranged at an interval along the main scanning direction and support the reflector.