Abstract: An electronic device comprising a multilayer semiconductor structure formed by a periodic structure having a first semiconductor layer and a second semiconductor layer, wherein in at least a portion of the multilayer semiconductor structure, the first semiconductor layer and the second semiconductor layer have different conduction types. The first semiconductor layer and the second semiconductor layer have different refractive indexes, and the multilayer semiconductor structure functions as a multilayer reflective mirror. As a result, an electronic device, a surface emitting laser, a surface emitting laser array, a light source, and an optical module with decreased parasitic capacitance can be realized.

Abstract: Disclosed are a PLC-type delay demodulation circuit and a PLC-type optical interferometer capable of reducing the size of a PLC chip with respect to the arrangement of various kinds of light output waveguides. In a PLC-type delay demodulation circuit, arm waveguides of a first MZI and arm waveguides of a second MZI are formed so as to overlap each other in the same region of a planar lightwave circuit. The optical paths of the MZIs are arranged such that the propagation directions of two DQPSK signals branched by a Y-branch waveguide are opposite to each other.

Abstract: An optical module includes a light-emitting device that outputs laser light, a temperature detection unit that is arranged in proximity to the light-emitting device and detects the temperature of the light-emitting device, a wavelength monitor unit that receives laser light outputted from the light-emitting device and having passed through an optical filter and monitors the wavelength of the laser light, and a temperature adjustment unit that adjusts the wavelength of laser light outputted from the light-emitting device based on a signal outputted from the wavelength monitor unit. The temperature adjustment unit adjusts the wavelength of the laser light so as to fall within a wavelength range, in which the wavelength is adjustable by the wavelength monitor unit, based on a signal from the temperature detection unit, and then adjusts the wavelength of the laser light so as to be locked at a predetermined wavelength based on the signal from the wavelength monitor unit.

Abstract: The optical fiber includes a center core portion, a side core portion and clad portion, which has a dispersion value of 14-20 ps/nm/km at a wavelength of 1550 nm, a dispersion slope of 0.05-0.08 ps/nm2/km at a wavelength of 1550 nm and a transmission attenuation of 0.2 dB/km or less at a wavelength of 1550 nm, wherein the relative refractive index difference &Dgr;1 between the center core portion and the clad portion is 0.25-0.50%, the relative refractive index difference &Dgr;2 between the side core portion and the clad portion is 0.05-0.30%, an inequality &Dgr;2<&Dgr;1 is satisfied, the ratio a/b between an outer diameter a of the center core portion and an outer diameter b of the side core portion is 0.3-0.7, and the effective core area Aeff at a wavelength of 1550 nm is 90 &mgr;m2 or larger.

Abstract: An electrical connection box has a casing 1 and a cover 2, which can be securely assembled, regardless of whether a packing is to be interposed therebetween. A female locking element 10 having a hook-shaped locking pawl 13 is formed on an outside surface of a side wall 1b of the casing. The cover is formed with a flexible male locking element 20, which is V-shaped in its cross-section and which is to be inserted into the female element. The male locking element is provided with locking holes 24a, 24b spaced a distance corresponding to the thickness of a watertight packing 3, and the locking pawl can be inserted into either of the locking holes.

Abstract: A heat pipe hinge structure for an electronic device comprises a heat pipe hinge member and a hinge portion. The heat pipe hinge member is made of a high heat-conductive material disposed at a coupling portion in which a pair of housing portions to be opened and closed are coupled. The heat pipe hinge member comprises a heat pipe hinge main body to receive a heat from a heat generating component disposed in one of the pair of housing portions, and a heat pipe holding portion provided in a vicinity of the heat pipe hinge main body to pivotably hold by an elastic member at least a part of a first heat pipe disposed in other of the pair of housing portion. The hinge portion is made of a low heat-conductive material to fix the heat pipe hinge member on at least one housing portion of the pair of housing portions.

Abstract: A plate type heat pipe comprises: a plate type container which includes a heat absorbing side and a heat dissipating side to form a hermetically sealed hollow portion; at least one heat transfer block which is thermally connected to each of inner walls of the heat absorbing side and the heat dissipating side; a wick which is placed along a side wall of the heat transfer block through the inner wall of the heat dissipating side; and a working fluid enclosed in the hollow portion. A securing member to secure the wick and the heat transfer block in close contact may be further included.

Abstract: An optical ferrule is a molding of a resin composition comprising a base resin, silica, and whisker, as essential components. The resin composition has a melt viscosity of 300 to 600 [Pa×sec.] when measured at a shear rate of 900 [1/sec.] at a temperature of 340° C. by using a capillary having a diameter of 0.1 mm and a depth of 30 mm as defined by JIS-K-7199. Preferably, the base resin is a linear polyphenylene sulfide resin, and 250 to 300 parts by weight of silica and 10 to 70 parts by weight of whisker are blended with 100 parts by weight of the linear polyphenylene sulfide resin.

Abstract: An internally-grooved heat exchanger tube according to the present invention is structured such that the internal surface is divided into a plurality of continuous areas (W1, W2) parallel to the axial direction (L) of the tube, a large number of fins (10, 11) different in at least one selected among lead angle (&thgr;, &thgr;′) to the axial direction (L) of the tube, fin vertical angle (&agr;, &agr;′) and fin pitch (p, p′) are formed in the adjacent areas (W1, W2), and a boundary portion (a) between the adjacent areas (W1, W2) is formed in the state of meandering to the axial direction (L) of the tube.

Abstract: There is provided a radiation-curable adhesive tape comprising a radiation-curable adhesive layer which is formed on a radiation transmitting-substrate. The radiation-curable adhesive layer is composed of an acrylic adhesive and radiation-curable compound having carbon-carbon double bonds. The radiation-curable tape can be used preferably in processing steps for the production of semiconductor wafer, ceramics and glass employing a direct picking-up system.

Abstract: A semiconductor laser element having a GaAs substrate formed thereon with an active layer of a strained quantum well construction provided with an In.sub.x Ga.sub.1-x As strained quantum well layer and a GaAs barrier layer and clad layers arranged up and down of said active layer through an epitaxial growth means. A lattice mismatching rate of the clad layer with respect to the substrate is less than 10.sup.-3.

Abstract: A closure for a cable connector covered at the ends of the cables connected to each other in a sleeve through end face plates for closing both ends of the sleeve. Grasping fittings are mounted at the ends of the cable contained in the sleeve which has axial restricting means and/or rotational restricting means provided in the sleeve for preventing the grasping fittings from moving axially and/or rotationally. Thus, the closure can provide mechanical strength sufficient for enduring loads such as tension, compression and twist transmitted through the cables.

Abstract: In a battery having a cathode in which a halogen is employed as an active material, the halogen is dissolved in an organic solvent such as a halogenated hydrocarbon, whereby the halogen is stored, and is utilized when needed. This battery can be applied as both a primary battery and a secondary battery. According to the battery of the present invention, a power required during the operation of the battery is reduced, whereby the total energy efficiency of the battery can be improved.