Tdk Corporation

Other

Seiko Epson Corporation

Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Chemical Corporation

Yutaka Ishihara

Toru Takahashi

Kazuo Okawa

Atsushi Kobayashi

Masanori Suzuki

Masahiro Nakano

Masayuki Yamashima

Hiroshi Okafuji

Jyunji Matsushima

Akiko Takeya

Teruaki Honda

A (meth)acrylic resin composition containing a (meth)acrylic polymer (P) and a phosphorus atom-containing compound (C), where the (meth)acrylic polymer (P) contains: (1) a repeating unit derived from methyl methacrylate at 19.95 to 84.95% by mass; (2) a repeating unit derived from a (meth)acrylic acid ester (M) having an aromatic hydrocarbon group or an alicyclic hydrocarbon group having from 3 to 20 carbon atoms in a side chain at 15.0 to 80.0% by mass; and (3) a repeating unit derived from a monomer (B) having two or more vinyl groups at 0.05 to 0.40% by mass, and an amount of the phosphorus atom-containing compound (C) with respect to 100 parts by mass of the (meth)acrylic polymer (P) being 5.0 to 35 parts by mass or less.

(Meth)acrylic resin composition and resin molded article

The present invention relates to a discharge lamp lighting apparatus which can prevent an increase of loss and a rise of temperature in the area where discharge lamp tube voltage is low. The power conversion circuitconverts the input power Pin to output the DC power Pd. The discharge lamp driving circuitconverts the DC power Pd supplied from the power conversion circuitto output AC voltage Vo and AC current Io. The controllerprovides constant power control for maintaining the AC power Po provided by the AC voltage Vo and AC current Io to be constant when the AC voltage Vo is higher than the predetermined value V, and provides power reduction control for reducing AC power Po to the power conversion circuitwhen the AC voltage Vo is lower than the predetermined value V

Discharge lamp lighting apparatus and discharge lamp apparatus

The present invention relates to a discharge lamp lighting apparatus in which overshoot occurring when the polarity of AC rectangular wave voltage/current is inverted is suppressed. An inverter converts DC power supplied by a converter to AC rectangular wave power and outputs the AC rectangular wave power. A power calculation unit generates a power detection signal based upon a voltage detection signal and a current detection signal detected on the output side of the converter. A control target value setting unit outputs an output power command value to be used to control the DC power so as to achieve a target value. A correction signal generation unit outputs a correction signal to be used to correct the output power command value in conformance to the power detection signal in synchronization with a polarity inversion of the AC rectangular wave power. A converter control signal generation unit outputs a signal corresponding to the error of the power detection signal relative to the output power command value. A pulse width control unit implements pulse width control on the converter based upon the signal provided by the converter control signal generation unit.

Discharge lamp lighting apparatus

The present invention relates to a switching power supply apparatus equipped with an over-temperature protection circuit that operates appropriately even when a problem occurs in the control circuit. A switching conversion circuit has a switching element turned on and off according to a drive signal S supplied from a drive circuit , converts the voltage supplied via a input circuit to switching output, and outputs that switching output. An output circuit is supplied with the switching output, adjusts the supplied switching output to a prescribed output, and outputs that prescribed output. A control circuit supplies a control signal S to the drive circuit . An over-temperature protection circuit comprises a temperature detector and a switch , and is connected to the control electrode of the switching element , and cuts off the drive signal S via the switch when the temperature detector detects an abnormal temperature in the switching power supply apparatus.

Switching power supply apparatus with over-temperature protection

A discharge lamp lighting apparatus which can prevent an increase of loss and a rise of temperature in the area where discharge lamp tube voltage is low. A power conversion circuit converts the input power Pin to output the DC power Pd. A discharge lamp driving circuit converts the DC power Pd supplied from the power conversion circuit to output AC voltage Vo and AC current Io. A controller provides constant power control for maintaining the AC power Po provided by the AC voltage Vo and AC current Io to be constant when the AC voltage Vo is higher than the predetermined value V , and provides power reduction control for reducing AC power Po to the power conversion circuit when the AC voltage Vo is lower than the predetermined value V

The present invention relates to a discharge lamp lighting method and a discharge lamp lighting apparatus that achieve a reduction in the extent of lamp flickering by adopting a relatively simple circuit structure. A power supply unit supplies AC power (Po) to a discharge lamp and a control unit implements control on the power supply unit so as to gradually increase the instantaneous value of the AC power (Po) during a half cycle (&tgr;/2) of an AC pulse current (Io) as the time elapses from the rise of the half cycle (&tgr;/2) toward an end of the half cycle.

Discharge lamp lighting method and discharge lamp lighting apparatus

In a case where an AC power is supplied from an AC power source to an AC circuit unit, the AC circuit unit and an DC circuit are connected to each other, a DC power is supplied from the AC circuit unit to the DC circuit unit, the DC power is converted to a required working voltage, and on the other hand, in a case where a DC power is supplied from a DC power source to the DC circuit unit, the DC power is converted to a required working voltage, and the DC power obtained as described above is used as a charging power for charging the secondary battery.

Growing community of inventors

Tokyo, Japan

Yutaka Ishihara