Abstract:
An interferometric semiconductor laser device having a built-in effective refraction index difference, based on the absorption of light by a substrate, between the portion of the active layer corresponding to the inside area of a striped channel formed on the surface of said substrate and the portion of the active layer corresponding to the outside area of said striped channel, wherein regions, which are positioned between the active layer and the substrate in the outside area of said channel along a waveguide formed in the active layer corresponding to said channel, are different from each other in the distance between the active layer and the substrate, thereby creating a difference in the effective refraction index between the portions of the active layer corresponding to said regions.
Abstract:
A semiconductor laser apparatus comprising: a semiconductor laser chip with a first light-emitting facet and a second light-emitting facet containing an interference effect-creating means therein for creating an interference effect within the resonator(s) thereof, a laser light-reflecting means for returning a part of the laser light emitted from the first light-emitting facet of said semiconductor laser chip to the first light-emitting facet, and a mounting base on which said semiconductor laser chip and said laser light-reflecting means are fixed in a parallel manner.
Abstract:
A hub assembly for use in a recording tape cartridge is composed of an inner body and an outer ring formed around the inner body so as to decrease distortion on the out-of roundness and the verticality of the outer cylindrical surface of the hub assembly.
Abstract:
An optical fiber which is able to transmit high power infrared energy, and is flexible and long in life is described. The fiber consists essentially of a mixed crystal of 40 to 45 wt % of thallium bromide and the balance of thallium iodide, each having a purity not less than 99.9%. The fiber is free of any particles having a size not smaller than 1 .mu.m.
Abstract:
An apparatus for measuring the reflectivities of the resonator facets of a semiconductor laser when the facets are covered with a protective coating of dielectric material or the like, which comprises photodetector means for individually measuring the laser light powers from both facets of the resonator, reflector means for reflecting the laser light from one of the facets back to the laser, shutter means openable or closable at a position to block the laser light reflected from the reflector means, and photodetector means for measuring the power of the reflected laser light.
Abstract:
A steering system for a vehicle with a front wheel and a rear wheel, in which the rear wheel is steerable in relation to a steering operation of the front wheel, such that a ratio control of a steered angle ratio of the rear wheel to the front wheel is effected to be variable in accordance with a travelling speed of the vehicle. The steering system is provided with a mode selecting unit adapted to be manually operable for exclusively setting an arbitrary one of a plurality of control modes of the ratio control. The steering system may be further provided with a time-delay unit for gradually effecting the ratio control, when changing one of the control modes to another thereof.
Abstract:
In energy separated quantum-counting radiography according to the present invention, radiation penetrating the subject being examined is detected as pulses. The pulses are counted for each radiation energy group, each comprising a separate pulse height group, to thereby speedily obtain a high resolution radiation image of the various materials of the subject.
Abstract:
An electric can opener comprising an opener body and a body support. The opener body includes a cutter and a toothed wheel adapted to be rotated by an electric motor. A can to be opened is placed on the wheel at its upper projecting edge, and rotated by the wheel as operated by the motor. During rotation the top of can is cut by the cutter. For usual use, the opener support can be placed on the upper surface of an object such as a kitchen table with its bottom in contact with the upper surface. For use in suspension, the support can be secured to the lower surface of a fixed object such as a hanged sideboard by installing its bottom to the lower surface. For usual use, the base of the support is located below the opener body. For use in suspension, the base of the support is located above the body.
Abstract:
A speaker diaphragm comprises a composite film prepared by combining a reinforcing material such as a mica, a needle or fiber filler, or talc, with a polybisphenol phthalate resin consisting of an aromatic dicarboxylic acid and a dihydric phenol.
Abstract:
A rock wool composite material obtained by mixing a fine rock wool having a diameter of 1 to 10.mu. and a length of 70 to 500.mu. and containing substantially no shots with a pulp-like substance of a heat-resistant aromatic polymer having a freeness value of 150 seconds or more and less than 500 seconds, is excellent in heat resistance, incombustibility, heat insulation and electrical insulation and is advantageously used as a substitute for an asbestos sheet or board.