Abstract: Provided is an endoscopic duct cleaning tool which uses elastic porous members to prevent the inside of a duct of an endoscope from being damaged, and which can firmly fix the elastic porous members to a core wire and secure a sufficient thickness in each of the elastic porous members. This endoscopic duct cleaning tool 1 is inserted into a duct 53 of an endoscope 50 to clean the duct 53. The endoscopic duct device 1 includes a core wire 10 consisting of a stranded wire, plural cylindrical elastic porous members 20 disposed at certain intervals and at certain places in an axial direction of the core wire 10 so as to cover an outer circumference of the core wire 10 directly, and resin tubes 30 covering outer circumferences of portions of the core wire 10 which are not covered with the elastic porous members 20. An outer diameter of each of the resin tubes 30 is formed to be larger than an inner diameter of each of the elastic porous members 20.

Abstract: An LED lighting device includes: a power source unit for supplying the DC output voltage to a light-emitting diode; a control unit for adjusting the DC output voltage; and a control power source unit for supplying a control power to the control unit. The control power source unit generates the control power with the DC output voltage and has: a current-limiting resistor for limiting an electric current that flows from the power source unit to the control unit; a constant voltage unit for converting a voltage to be applied to the control unit through the current-limiting resistor unit to a constant voltage; and a switching unit for switching a resistance value of the current-limiting resistor unit among a plurality of resistance values.

Abstract: A control means has an adjustment function in a microprocessor to adjust variations in an output to a discharge lamp due to variations in components by correcting a duty ratio of a PWM signal for varying an operating frequency of an inverter circuit so that a detected value of a second detection circuit falls within a target range. The microprocessor switches paths to transmit the PWM signal between a path passing through a feedback circuit and a path passing through a voltage follower circuit by switches a switch circuit to supply the signal through the path passing through the voltage follower circuit in adjusting output variations in the preheating mode and the starting mode.

Abstract: 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.

Abstract: A electronic ballast includes an inverter circuit for converting a DC voltage into a high-frequency voltage, a resonant circuit connected between outputs of the inverter circuit so as to light a discharge lamp by a resonant action, a control circuit for controlling the inverter circuit, a dimming circuit for continuously changing an output voltage to the discharge lamp by changing an operation frequency in the inverter circuit, a DC component detection circuit and a voltage comparator for detecting whether or not the discharge lamp is at the end of the life at predetermined intervals and outputting an end of life detection signal upon detection of the end of the life state, and a frequency control circuit and a driving circuit for reducing or stopping an output to the discharge lamp by controlling switching elements in response to a life end detection signal inputted from the voltage comparator.

Abstract: A transmission system includes: a transmission-side device that has a transmission-side clock generation unit that generates a first clock signal on the basis of a reference clock signal; a clock extraction unit that removes a data clock signal superimposed with transmission data to a reception-side device; a clock difference acquisition unit that determines a difference between the first clock signal and the data clock signal; and a packet generation unit that packetizes the information on the difference determined by the clock difference acquisition unit; and the reception-side device that has a reception-side clock generation unit that generates a second clock signal on the basis of the reference clock; a packet reception unit that receives the information on the packetized difference from the transmission-side device; and a data clock regeneration unit that regenerates the data clock signal on the basis of the second clock signal and the difference information.

Abstract: Provided is an endoscopic duct cleaning tool which uses elastic porous members to prevent the inside of a duct of an endoscope from being damaged, and which can firmly fix the elastic porous members to a core wire and secure a sufficient thickness in each of the elastic porous members. This endoscopic duct cleaning tool 1 is inserted into a duct 53 of an endoscope 50 to clean the duct 53. The endoscopic duct device 1 includes a core wire 10 consisting of a stranded wire, plural cylindrical elastic porous members 20 disposed at certain intervals and at certain places in an axial direction of the core wire 10 so as to cover an outer circumference of the core wire 10 directly, and resin tubes 30 covering outer circumferences of portions of the core wire 10 which are not covered with the elastic porous members 20. An outer diameter of each of the resin tubes 30 is formed to be larger than an inner diameter of each of the elastic porous members 20.

Abstract: A stent includes a plurality of annular units each made of a linear portion which extends circumferentially while folding in a zigzag manner and which is connected annularly, and connection portions which connect axially adjacent ones of the annular units with each other. Predetermined annular units have radiopaque markers each fixedly attached midway between one folded portion and a next folded portion in the linear portion located in a predetermined circumferential position.

Abstract: The invention is to provide a medical treatment tool for tubular organ which can surely capture or pick foreign substances such as calculi, other living tissues, etc. generated in a tubular organ or a body cavity and which can discharge or collect those foreign substances, other living tissues, etc. smoothly. The medical treatment tool 10b for tubular organ includes: a tube 15; a wire 25 made of a shape memory alloy and inserted in the tube 15; a basket 30b formed into a cylindrical shape by knitting and/or braiding a plurality of metal wire rods 31, a base end portion thereof being bundled and connected to a tip end portion of the tube 15, a tip end portion thereof being bundled and connected to a tip end portion of the wire 25; and a handle portion 40 which holds a base end portion of the tube 15 and which holds a base end portion of the wire 25 to allow a relative movement to the tube 15.

Abstract: A power amplifier includes: a distortion compensating circuit that causes a bias circuit to have an output impedance so that a subsequent block bipolar transistor for signal amplification-use has a maximized saturated output power; and a distortion compensating circuit that causes a bias circuit to have an output impedance so that a distortion of an output power of the power amplifier 1 with respect to an input power is canceled by a distortion characteristic of an output power with respect to an input power of the subsequent block bipolar transistor for signal amplification-use which has a maximized saturated output power and a distortion characteristic of an output power with respect to an input power of the preceding block bipolar transistor for signal amplification-use. This makes it possible to provide a power amplifier that allows reduction in saturated output power brought by realization of a highly efficient low-distortion power amplifier.

Abstract: The present invention provides a transmission apparatus including transmitting side line interfaces which convert packet format data sent from an asynchronous network to a SONET/SDH frame format and then transmit the data, multiple receiving side line interfaces which receive the SONET/SDH frame format data and convert the data to packet format data and a circuit switching section which performs circuit switching. The transmitting side line interfaces include a variable length frame mapping section which converts the packet format data to variable length frame format data and a time division multiplexing mapping section which converts the variable length frame format data to the SONET/SDH frame format data. The receiving side line interfaces include a variable length frame demapping section which reconverts the SONET/SDH frame format data to variable length frame format data.

Abstract: There is provided a stent which can be surely indwelled up to a deeper place than an obstructed or stenosed portion of a tubular organ so as to exhibit an expansion force and keep flexibility. The stent 1 has a plurality of annular units 10 and 20 each made of a linear portion 11 which extends circumferentially while folding in a zigzag manner and which is connected annularly, and connection portions 40 which connect axially adjacent ones of the annular units with each other. Predetermined annular units 20 have radiopaque markers 30 each fixedly attached to a midway between one folded portion 13 and a next folded portion 13 in the linear portion 11 located in a predetermined circumferential position.

Abstract: An electronic ballast is capable of inhibiting ballast shutdown caused by erroneously determining a fault condition. The ballast includes a DC power supply circuit for outputting DC power, a power conversion circuit that appropriately converts DC power outputted by the DC power supply circuit and outputs it to a discharge lamp, a DC voltage droop detection circuit for determining existence/absence of a fault condition in the DC power supply circuit 1, a lamp end of life detection circuit for determining existence/absence of a fault condition of the discharge lamp; and a sequence control circuit and a shutdown control circuit that control at least the power conversion circuit according to detection by the DC voltage droop detection circuit the discharge lamp life detection circuit.

Abstract: An electronic ballast includes circuitry to prevent a switch from being damaged in the case where an abnormality occurs in an output voltage of an input power supply. A DC power supply control circuit has a zero current detection circuit that, when a current through an inductor becomes equal to or less than a predetermined current value, outputs a zero signal. A peak current detection circuit, when current through a switch the DC power supply circuit becomes equal to or greater than the predetermined current value, outputs a peak signal. A first drive circuit turns on the switch according to the zero signal, and turns off the switch Q1 according to the peak signal. The zero current detection circuit is provided with a mask circuit that stops the zero signal from being outputted to the first drive circuit for a predetermined period after the current through the inductor has become equal to or less than the predetermined current value.

Abstract: A power amplifier includes: a distortion compensating circuit that causes a bias circuit to have an output impedance so that a subsequent block bipolar transistor for signal amplification-use has a maximized saturated output power; and a distortion compensating circuit that causes a bias circuit to have an output impedance so that a distortion of an output power of the power amplifier 1 with respect to an input power is canceled by a distortion characteristic of an output power with respect to an input power of the subsequent block bipolar transistor for signal amplification-use which has a maximized saturated output power and a distortion characteristic of an output power with respect to an input power of the preceding block bipolar transistor for signal amplification-use. This makes it possible to provide a power amplifier that allows reduction in saturated output power brought by realization of a highly efficient low-distortion power amplifier.

Abstract: A transmission system includes: a transmission-side device that has a transmission-side clock generation unit that generates a first clock signal on the basis of a reference clock signal ; a clock extraction unit that removes a data clock signal superimposed with transmission data to a reception-side device; a clock difference acquisition unit that determines a difference between the first clock signal and the data clock signal; and a packet generation unit that packetizes the information on the difference determined by the clock difference acquisition unit; and the reception-side device that has a reception-side clock generation unit that generates a second clock signal on the basis of the reference clock; a packet reception unit that receives the information on the packetized difference from the transmission-side device; and a data clock regeneration unit that regenerates the data clock signal on the basis of the second clock signal and the difference information.

Abstract: A control means has an adjustment function in a microprocessor to adjust variations in an output to a discharge lamp due to variations in components by correcting a duty ratio of a PWM signal for varying an operating frequency of an inverter circuit so that a detected value of a second detection circuit falls within a target range. The microprocessor switches paths to transmit the PWM signal between a path passing through a feedback circuit and a path passing through a voltage follower circuit by switches a switch circuit to supply the signal through the path passing through the voltage follower circuit in adjusting output variations in the preheating mode and the starting mode.

Abstract: A electronic ballast includes an inverter circuit for converting a DC voltage into a high-frequency voltage, a resonant circuit connected between outputs of the inverter circuit so as to light a discharge lamp by a resonant action, a control circuit for controlling the inverter circuit, a dimming circuit for continuously changing an output voltage to the discharge lamp by changing an operation frequency in the inverter circuit, a DC component detection circuit and a voltage comparator for detecting whether or not the discharge lamp is at the end of the life at predetermined intervals and outputting an end of life detection signal upon detection of the end of the life state, and a frequency control circuit and a driving circuit for reducing or stopping an output to the discharge lamp by controlling switching elements in response to a life end detection signal inputted from the voltage comparator.

Abstract: 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.