Funai Electric Company Ltd.

Sanyo Electric Co., Ltd.

Other

Sanyo Technosound Co., Ltd.

Sanyo Tecnosound Co., Ltd.

Hitoshi Miyamoto

Takashi Jinnouchi

Masanao Yoshida

Yasushi Obata

Katsuyuki Matsumoto

Yoshimasa Ono

Kazuo Nishinosono

Toshihiro Waguri

Hiroyoshi Sato

Yoshiho Suzuki

Shinya Uchida

Shinya Miyazona

Shigeru Ueuchi

A self-excited inverter comprises a pair of switching devices and a transformer having a primary side to which the switching devices are connected and a secondary side to which a lamp is connected. A pulse voltage is applied alternately to gates of the individual switching devices through a drive winding of the transformer, causing the switching devices to turn on and off in alternate turns to produce an AC voltage which is supplied from a pair of main windings of the transformer to the secondary side thereof. An input voltage supplied to the main windings of the transformer is divided by a voltage divider circuit configured with a plurality of resistors and voltages divided by the voltage divider circuit are applied to the gates of the individual switching devices so that the startup voltage follows the input voltage.

Self-excited inverter and LCD television apparatus

A first microphone device according to the present invention comprises a pair of directional microphones with high directivity in a sound collecting direction, a pair of nondirectional microphones with low directivity in the sound collecting direction, and a casing accommodating the pair of directional microphones and the pair of nondirectional microphones. The pair of nondirectional microphones is arranged so that sound collecting directions thereof are outward from both side surface walls of the casing, while the pair of directional microphones is arranged so that sound collecting directions thereof are outward from a front surface wall of the casing and intersect each other in vicinity of the front surface wall. All or a part of the pair of directional microphones is accommodated in a space sandwiched by the pair of nondirectional microphones.

Microphone device and portable recorder comprising same

A synchronous rectifier circuit (DC-DC converter) includes a CR integration circuit and a discharge circuit. The CR integration circuit outputs a voltage that varies at delayed timing as compared with a voltage induced in a secondary-side main winding. The discharge circuit discharges a gate voltage of a rectifier transistor as a result of conduction of a discharge transistor in response to the output voltage from the CR integration circuit. According to such a configuration, the rectifier transistor is turned off earlier than the timing of switching of polarity of voltages induced in the secondary-side main winding and a secondary-side auxiliary winding in response to turn-on of a primary-side transistor.

Synchronous rectifier circuit capable of preventing flow-through current

A liquid crystal televisiondisplays an image on a liquid crystal display by transmitting a light source from a backlight unit. The backlight unitdrives two cold-cathode tubesas the backlightat the high frequency voltages each with different polarity generated by a self-excited inverter circuitto generate a light source. The backlight unitconnects an inter-lamp coil Lbetween two U-shaped cold-cathode tubesto form a series circuit, and further connects capacitors C, Cin parallel with the cold-cathode tubes

Liquid crystal television and backlight unit

A microphone device according to the present invention comprises a plurality of microphones and a microphone holder for holding the microphones. The microphones include a first sound receiving part and a second sound receiving part. The microphone holder comprises a holder body, and the holder body includes a plurality of microphone engaging recesses facing in different directions from each other and to be removably in engagement with the plurality of microphones. These microphone engaging recesses are to be in engagement with the plurality of microphones with the first sound receiving part facing the outer side of the holder body.

Microphone holder and microphone device using same

A fluorescent tube power supply including a rectification circuit, a smoothing circuit, an inverter, and a control circuit for controlling the inverter, further includes a current detecting unit for detecting an input current of the inverter. The control circuit is stopped based on an output signal of the current detecting unit when the input current increases.

Fluorescent tube power supply and backlight

A fluorescent tube power supply including an inverter power supply which outputs a DC voltage, and an inverter which converts an output of the inverter power supply to an AC; wherein a power stabilizing unit for stabilizing a power input to the inverter is arranged between the inverter power supply and the inverter; and a feedback control of the inverter power supply is performed based on an output of the power stabilizing unit. The power stabilizing unit detects a current flowing between the inverter power supply and the inverter, and the feedback control of the inverter power supply is performed based on the current.

The present invention discloses a lighting unit comprising: a reflector panel; a plurality of substantially U-shaped cold cathode tubes held parallel relative to the reflector panel; an inverter substrate; cold cathode tube holders for holding the cold cathode tubes parallel relative to the reflector panel in such a manner that terminals of the cold cathode tubes are arranged in a row along one side of the reflector panel; a substrate holder for holding the inverter substrate to be vertically relative to the reflector panel in such a manner that a lower side of the inverter substrate reaches a positions where the terminals are arranged in a row; a plurality of notches upwardly cut deep from the lower side of the inverter substrate so as to receive the terminals; and solders provided for making electrical connections between the terminals and electrical supply patterns formed in the notches.

Liquid crystal display apparatus and lighting unit

A self-excited inverter circuit, includes: a booster transformer with a secondary coil, a feedback coil, and a primary coil respectively wound thereon, the primary coil including a center tap to which operating power can be supplied; a first N-channel FET having a drain to which is connected one terminal of the primary coil, and having a gate to which is connected one terminal of the feedback coil; and a second N-channel FET having a drain to which is connected the other terminal of the primary coil, and having a gate to which is connected the other terminal of the feedback coil, wherein: using a high voltage drive output generated in the secondary coil when the first and second N-channel FETs are turned on alternately, a discharge tube is driven and turned on; and the first and second N-channel FETs are both formed in a single package.

Self-excited inverter circuit

A circuit that can avoid drops in power supply and heat generation and save on manufacturing costs with no need of external controls are configured such that: a switching transformer has a terminal that produces an output of 22V at power-on and an output of 8V during standby and a terminal that produces an output of 10V at power-on and an output of 3V during standby; the output of 22V or 8V is lowered to 5V by a regulator ICand applied (input) to a regulator IC; an input of 10V or 3V is produced at the regulator IC; at power-on, the regulator IClowers 10V to 3.3V and supplies the lowered 3.3V to the inverter circuit; and during standby, a regulator IC lowers 8V to 3.3V and supplies the lowered 3.3V to the inverter circuit

Voltage for LCD

An audio recording device is provided with a first casing, which includes a sound collection means, a second casing, which includes a terminal for connection to an external device. One end portion of the second casing is rotatably joined to a lower end portion of the first casing, such that the second casing can be folded and stored on a rear side of the first casing; the sound collection means is provided at an upper portion of the first casing; and the connection terminal is protrudingly provided on another end portion of the second casing. Furthermore, a recessed portion, into which the connection terminal is fitted, may be formed at a raised portion on the rear side of the first casing, and a front end portion of the connection terminal may be covered by a wall of the recessed portion when the second casing is in a folded and stored state.

Audio recording device

A secondary winding Wof a step-up transformer of a self-excited inverteris grounded at the midpoint thereof. High-frequency voltages differing in polarity from each other are outputted from both terminals OTand OTof the secondary winding W. Two U-shaped cold-cathode tubes Land Lseries-connected to each other are provided directly below a liquid crystal panel. One of terminals of the secondary winding Wis connected to the terminal OTthrough the ballast capacitor C. The other terminal thereof is connected to the terminal OTof the ballast capacitor C. The connecting point P between the two U-shaped cold-cathode tubes Land Lis ungrounded. Thus, electric currents flowing through the cold-cathode tubes are equal in value to each other.

Backlight apparatus for liquid crystal display

MOS transistor cellsand MOS transistor cellshaving different gate threshold voltages are formed on a chip. The MOS transistor cellshaving the different gate threshold voltages are connected in parallel.

MOS transistor and switching power supply

There is provided with a breaking resistor R inserted at an arbitrary portion of a current path from the output point of a primary side positive power supply IN&plus; to the drain of an FET . Supposing that a value obtained by dividing a resistance value by a rated watt is a broken index, the broken index of the breaking resistor R is set to be larger than that of a current detection resistor R

Switching power supply

A disk playback device including a memory for temporarily storing data from a pickup and outputting the data as delayed by a predetermined period of time, manual keys, and a system control circuit for detecting the playback end of a disk from the playback data from the pickup. The memory has connected thereto an erase circuit for erasing data remaining in the memory. The system control circuit produces different flag values in a first case wherein the control circuit detects the disk end to terminate playback of the disk and in a second case wherein the user manipulates one of the manual keys to terminate the playback. A memory control circuit is connected to the memory and the system control circuit. In the first case, the memory control circuit inputs to the memory playback data of another disk replacing the disk as continued from the data remaining in the memory. In the second case, the circuit inputs to the memory the playback data of another disk replacing the preceding disk after the data remaining in the memory is erased by the erase circuit.

Growing community of inventors

Osaka, Japan

Hitoshi Miyamoto