Abstract: A semiconductor laser device comprises a base, a first conductive layer, a second conductive layer, a third conductive layer, and a semiconductor laser chip in this order, each of which has a respective emitting-side end portion. The emitting-side end portion of the first conductive layer is in a common plane with the emitting-side end portion of the base. A thickness of the second conductive layer is greater than a thickness of the first conductive layer. The emitting-side end portion of the second conductive layer is disposed inward of the emitting-end portion of the first conductive layer. The emitting-side end portion of the third conductive layer is in a common plane with the emitting-side end portion of the second conductive layer. The emitting-side end portion of the semiconductor laser chip is disposed outward of the emitting-side end portion of the third conductive layer.

Abstract: The present invention relates to a thermoplastic resin composition which has an improved impact resistance while maintaining mechanical properties such as strength and rigidity. In the present invention, a thermoplastic resin (A) is mixed with a polytetrafluoroethylene-containing mixed powder (B) consisting of a polytetrafluoroethylene (b1) having a particle diameter of 10 ?m or less and an organic polymer (b2). In this case, the polytetrafluoroethylene-containing mixed powder (B) is mixed so that the amount of a polytetrafluoroethylene component is from 0.0001 to 20 parts by weight based on 100 parts by weight of the thermoplastic resin (A), and a polymer having an epoxy group was used as the organic polymer (b2). The thermoplastic resin composition of the present invention can be widely used in the fields of automotive parts, electric and electronic parts, and precision instrument parts.

Abstract: An optical disk has a servo area composed of a synchronous pit and guard pits provided on each track and a data area composed of data pits. In recording and reproducing digital data on and from the optical disk, a beam spot of laser beam is traced on centerlines between adjacent two tracks. In the tracking of this case, a reflected light is changed due to a tracking error with an arrangement of the synchronous pit and the guard pits on an odd track and an arrangement of the synchronous pit and the guard pits on an even track. A tracking servo is made by comparing output levels of the reflected light changed before and after this synchronous pit.

Abstract: The present invention relates to a thermoplastic resin composition which has an improved impact resistance while maintaining mechanical properties such as strength and rigidity. In the present invention, a thermoplastic resin (A) is mixed with a polytetrafluoroethylene-containing mixed powder (B) consisting of a polytetrafluoroethylene (b1) having a particle diameter of 10 &mgr;m or less and an organic polymer (b2). In this case, the polytetrafluoroethylene-containing mixed powder (B) is mixed so that the amount of a polytetrafluoroethylene component is from 0.0001 to 20 parts by weight based on 100 parts by weight of the thermoplastic resin (A), and a polymer having an epoxy group was used as the organic polymer (b2). The thermoplastic resin composition of the present invention can be widely used in the fields of automotive parts, electric and electronic parts, and precision instrument parts.

Abstract: A highly reliable electrooptical device comprises a pair of electrode plates facing each other with a space and sealed along their periphery by a sealing material to form a cell and an electrooptical material sealed in the cell. The device is characterized in that a protective layer of an electrically conductive material comprising electrically conductive particles and a binder is coated on each lead terminal extending outside the sealing material and the protective layer is partially embedded in the sealing material.