Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Nobuyuki Tokubuchi

Takashi Haruguchi

Shogo Horinouchi

Taiichi Mori

Hideki Yoshinaka

Shin Ishibashi

Hitoshi Asahi

Masahiro Inoue

Tatsuro Miyazaki

Masaaki Arita

Kazuhiko Noda

Kensei Fukuda

Shoichi Shimizu

Yota Hashimoto

Mashaaki Arita

Shouji Kuroda

An optical pickup device includes light sources for respectively emitting a plurality of different wavelengths of light, a unit structured for causing at least a part of the light emitted from the light sources to pass a same optical path; and a focusing unit for focusing the light. The focusing unit includes at least first and second focusing parts, the first focusing part being to focus mainly a wavelength of light different from a wavelength of light to be mainly focused by the second focusing part. The optical pickup device and optical disk device are capable of realizing at least one of thickness reduction, size reduction and suppression against characteristic deterioration even where coping with various wavelengths of laser including a blue laser.

Objective lens, optical pick-up device, and optical disk device

To provide an optical pickup device and optical disk device capable of realizing at least one of thickness reduction, size reduction and suppression against characteristic deterioration even where coping with various wavelengths of laser including a blue laser. An optical pickup device comprising light sources for respectively emitting a plurality of different wavelengths of light, unit structured for causing at least a part of the light emitted from the light sources to pass a same optical path; and focusing unit for focusing the light. The focusing unit includes at least first and second focusing parts, the first focusing part being to focus mainly a wavelength of light different from a wavelength of light to be mainly focused by the second focusing part.

The present invention provides the exhaust gas purification catalysts containing a first catalyst component comprising an inorganic oxide having heat resistance and a transition metal oxide supported on the surface of the inorganic oxide and a second catalyst comprising at least one alkali metal sulfate, which have a high catalytic activity for the burning of particulates.

Exhaust gas purification catalyst and exhaust gas purification material

The particulates, etc. deposited on the trap are burnt in such a manner that the trap is heated so that the temperature of the trap does not exceed 500&deg; C. or the maximum temperature gradient in radial direction of the trap is 20&deg; C./mm or less, preferably 10&deg; C./mm or less.

Method for purification of exhaust gas

A catalyst for exhaust gas purification characterized by high catalytic activity, heat resistance, and toxin resistance includes a metal oxide and at least one alkali metal sulfate or at least one alkaline earth metal sulfate. The process for producing the catalyst includes mixing the metal oxide with an aqueous solution of the sulfate, evaporating the mixture to dryness, and heat-treating the resultant mixed powder. An exhaust gas purifying apparatus includes an exhaust gas purifying filter having a high exhaust gas purification rate and an excellent durability. The filter includes a ceramic filter with a heat-resistant coating layer thereon for support of the catalyst.

Catalyst for purifying exhaust gas, process for production thereof,

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Saga, Japan

Nobuyuki Tokubuchi