Abstract: A semiconductor laser device is provided which is constituted by semiconductor materials so as to emit laser light from a cavity end facet, the laser light being excited in a waveguide within an active layer sandwiched between a pair of cladding layers, wherein a window layer made of a semiconductor material having a band gap greater than that of the active layer is formed on the cavity end facet from which the laser light is emitted, so as to have a thickness sufficient to prevent local generation of crystal defects by lattice mismatching between the semiconductor material of the window layer and the semiconductor materials at the cavity end facet. There is also provided a method for producing such a semiconductor laser device with high efficiency.

Abstract: A light wavelength converter which includes a laser beam source for radiating fundamental waves, a first optical waveguide formed on a substrate so as to convert the fundamental waves into harmonics which are radiated through the substrate, a grating coupler provided on the substrate so as to receive the harmonics propagated through the substrate, and a second optical waveguide formed on the substrate, the second optical guide being connected to the grating coupler so as to radiate the harmonics outside.

Abstract: A field-emission type switching device includes a substrate formed with a recess having a straight edge and serrated edge opposite to the straight edge. A gate electrode is formed at the bottom of the recess. An emitter electrode is provided over the substrate and formed with a serrated edge which is slightly off alignment with the serrate edge of the recess so as to provide an emitter overhanging portion overhanging the recess. Similarly, a collector electrode is provided over the substrate means and formed with a straight edge which is slightly off alignment with the straight edge of the recess so as to provide a collector overhanging portion overhanging the recess. The emitter and collector electrodes are disposed in one plate and the gate electrode is disposed in another plane below the one plane.

Abstract: A planar type cold cathode for generating electron field emission which has a planar cold cathode having triangular convex portions and an anode confronting the triangular convex portions wherein each convex portion has a sharp tip end having a radius of curvature of 0.1 .mu.m or less. Also, a manufacturing method therefor is disclosed. In this method, sharp tip ends of the cold cathode are formed by using a normal etching technique.

Abstract: A laser beam oscillating apparatus which includes a plurality of semiconductor laser beam oscillators (21, 22, 23) oscillating laser beams of a different wavelength from each other, an optical waveguide (12) formed on a substrate (11) so that the oscillated laser beams propagate therein and are then emitted in the same direction from the output end thereof and an optical coupler (13) to introduce the laser beams into the optical waveguide, thus allowing simultaneous introduction of these semiconductor laser beams of different wavelengths into the optical waveguide and simultaneous output of them in the same direction from the output end thereof.

Abstract: A compound represented by the formula: ##STR1## wherein R.sup.1 and R.sup.2 each represent a hydrogen atom, a halogen atom, a nitro group, a lower alkyl group or a trifluoromethyl group; R.sup.3 represents a hydrogen atom, a lower alkyl group, a phenyl group or a lower alkoxy-carbonyl group; R.sup.4 and R.sup.5 each represent a hydrogen atom or a lower alkyl group; R.sup.6 represents a halogen atom; and X represents an oxygen atom or a sulfur atom,and a microorganism control agent, comprising the above compound as an active ingredient.

Abstract: A light wavelength converter which includes a light source for emitting fundamental waves having a desired wavelength, a first loop-shaped optical waveguide for converting the fundemental waves into harmonics, and a second optical waveguide for receiving the light from the source, wherein the two waveguides are coupled by an optical directional coupler.

Abstract: A moisture sensing element includes a moisture permeable gold electrode film formed on a moisture sensitive polyvinyl alcohol film which is carried by a glass substrate. The moisture permeable gold electrode film is formed by a vacuum evaporation under a nitrogen gas pressure of 1.0.times.10.sup.-3 Torr through 1.0.times.10.sup.-2 Torr. The deposition rate is about 0.5 .ANG./sec., and the moisture permeable gold electrode film has a thickness of 100 .ANG. through 200 .ANG..

Abstract: There are disclosed a 3,4-dihydro-2H-1,4-benzoxazine derivatives represented by the formula: ##STR1## wherein X represents a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, a halogen atom, a trifluoromethyl group, a phenoxy group, or a halogen-substituted phenoxy group; n is 0, 1, 2 or 3; Y represents an oxygen atom or a sulfur atom; and R.sub.1 and R.sub.2 each represent a hydrogen atom or an alkyl group having 1 to 5 carbon atom, provided that the case where both of R.sub.1 and R.sub.2 are hydrogen atoms is excluded, and a herbicidal composition containing the same as an active ingredient, useful for combatting weeds.

Abstract: An optically sensing device is made up of the sensor materials that cause the value of birefringence to vary itself in accordance with external physical volume; a polarizer and an element provided with two total reflection surfaces causing the beam path to invert its direction by an angle of 180.degree.. The optically sensing device has the capability of setting the phase bias by applying the two total reflection surfaces causing the beam path to invert its direction by an angle of 180.degree.. Since each element has different functions, one functioning as a mirror and the other as a quarterwave plate, the optically sensing device is of extremely simple structure and is compact. In addition, since the optically sensing device provides a constant phase bias unlike the unstable performances of conventional quarterwave plates, it guarantees high-precision performance. Also, the use of inexpensive elements ensures reduced cost.

Abstract: Disclosed is an electrophotography photosensitive member (10) and a method for fabricating the same. This electrophotography photosensitive member (10) comprises a straight chain compound polymer including (i) as main component, a straight chain compound polymer having p-phenylene in the direction of a main chain, and an element of Group VIB at a para-position, the element of Group VIB being selected from the group consisting of S, Se, Te and mixtures thereof; and (ii) oxygen atom. Since oxygen atom is included in the straight chain compound polymer, desirable characteristics are obtained. This photosensitive member (10) is produced at a low cost with a high productivity, thereby providing a high sensitivity, an excellent printing durability and a long lifetime.

Abstract: Disclosed are a radiation detector and a method of manufacturing the same. The radiation detector includes a radiation screening member for cutting off radiation incident upon the marginal portions of the radiation incident surface of a semiconductor radiation sensor or a semiconductor radiation sensor array for outputting pulses in correspondence with radiation photons, as well as upon the boundary portions between adjacent sensors. In order to manufacture such a radiation detector, leads are provided by the wire bonding, soldering or bump contacting on the radiation screening member, and at least part of the radiation screening member is then fitted to the semiconductor radiation sensor or the semiconductor radiation sensor array so as to make it electrically connected to the electrodes of the semiconductor radiation sensor or the semiconductor radiation sensor array.

Abstract: A variable interferometric device comprising a Fabry-Perot interferometer composed of a pair of reflecting substances facing each other with a space therebetween formed by spacers and a means for deforming at least one of the reflecting substances constituting said Fabry-Perot interferometer to thereby change the interferometric characteristics of said Fabry-Perot interferometer.

Abstract: Disclosed is a process for producing a controlled release preparation, which comprises:mixing a resin with a carrier;impregnating the resulting mixture with a drug; andapplying pressure to the mixture to form a solid.The controlled release preparation according to this invention can securely and stably release a drug for a desired period of time.

Abstract: A field effect transistor-type sensor comprising a field effect transistor device incorporated with a sensitive means exhibiting electric variation due to a physical or chemical interaction with the physical quantity to be detected, wherein an auxiliary electrode for the application of a drift-cancellation voltage to said sensitive means is located on said sensitive means, thereby suppressing the influence of impurities and/or ions contained in the sensitive means and/or the interface between the sensitive means and the field effect transistor device, or impurities and/or ions contaminating the device from the external atmosphere during use thereof, on the operation and/or the output of the field effect transistor device, and maintaining the stable output characteristic over a long period of time.

Abstract: Apparatus and method for substantially equalizing the potential drop along a line cathode used in an electron beam source adapted for use in a flat display device. The apparatus and method ensure that electrons from a power source are fed through both ends of the line cathode, substantially simultaneously. Thereby, the potential drop along the axial length of the line cathode is decreased, improving the uniformity of brightness of the display.

Abstract: A field effect transistor-type moisture sensor comprising a field effect transistor device incorporated with a moisture sensitive means, the electrostatic capacity or the electrical conductivity of which varies with the absorption and the desorption of water vapor or moisture, wherein said moisture sensitive means is disposed on a gate insulating film of said field effect transistor device to form an electrode structure, said moisture sensitive means being a film prepared by cross-linking cellulose acetate butyrate with at least one selected from the group consisting of compounds containing two or more isocyanate groups; compounds containing two or more epoxy groups; compounds containing two or more carboxylic acid groups; and acid anhydrides of carboxylic acids.

Abstract: A moisture sensor comprising a substrate, a bottom electrode formed on said substrate, a moisture sensitive film formed on said bottom electrode and a moisture permeable electrode formed on said moisture sensitive film, said moisture sensitive film being formed by heat-treating polyvinyl alcohol, thereby exhibiting a moisture sensitive characteristic which has a linear relationship between the impedance and the relative humidity.

Abstract: A rotary damper with a directional property is disclosed which is capable of being simplified in structure, manufactured with a low cost, and stably and precisely operated. The rotary damper is constructed in such a manner that a clutch spring is interposed between a revolving shaft and a rotor to selectively carry out the integral rotation of the rotor with the shaft or the stop of the rotor independent from the shaft.

Abstract: A camera shutter mechanism for opening and closing a shutter aperture to effect an exposure comprises a group of opening blades movable, when released, from a closed position covering the shutter aperture to an open position uncovering the shutter aperture to thereby initiate an exposure, and a group of closing blades movable, when released, from an open position uncovering the shutter aperture to a closed position covering the shutter aperture to thereby terminate the exposure. A release mechanism releases the opening blades thereby enabling them to move to the open position for initiating the exposure, and subsequently releases the closing blades thereby enabling them to move to the closed position for terminating the exposure.