Abstract: According to the present invention, an induction heating apparatus comprises a rectifying circuit for rectifying an AC voltage from an AC power source, an inverter circuit for converting a DC output from the rectifying circuit to a high frequency current and supplying it to a heating coil, a circuit for detecting a fluctuation in the AC power source through a low voltage converting section coupled to the AC power source, this detecting circuit having a detection characteristic which can hold the detecting state for at least a constant time, and a controlling circuit for controlling the inverter circuit in the stopped state or driving state in accordance with the presence or absence of a detection output from the circuit for detecting the fluctuation in the AC power source voltage.

Abstract: A wrist mechanism of an industrial robot provided at the extremity of the robot arm (20) and having two degrees of freedom of motion enabling a wrist unit (30) to perform a tilting motion and a swivel motion about two substantially perpendicular intersecting axes respectively. Either a motion transmitting mechanism for the tilting motion of the wrist unit or a motion transmitting mechanism for the swivel motion of the wrist unit (80, 82, 90, 92, 96) is provided with a bevel gear mechanism (96) to change the direction of motion transmission through an angle of 90.degree.. Overtravel detecting means (110a, 110b, 120a, 120b) for detecting the overtravel of both the above-mentioned motions and datum position of motion detecting means (112a, 112b, 122a, 122b) are coaxially arranged about one of the above-mentioned perpendicular intersecting axes.

Abstract: A recording medium is provided which comprises (a) a first recording layer; (b) a second recording layer provided in contiguity to the first recording layer; and (c) a separation layer for spatially separating the first and second recording layer. The first recording layer has a sufficient film thickness not to permit the recording to be effected on the second recording layer, while the recording operation is performed on the first recording layer, and the recording operation is effected on the second recording layer at positions corresponding to defective portions in the first recording layer.

Abstract: In an ink jet head comprising an orifice provided on a substrate for discharging an ink to form flying droplets, an ink channel provided on the substrate and communicating with the orifice, energy generating elements provided on the substrate for generating energy to be applied for discharging the droplets, and an intermediate ink chamber provided on the substrate for holding the ink to be supplied to the ink channel, the ink jet recording head has positioning guides for aligning side and rear wall members constituting the intermediate ink chamber at predetermined positions on the substrate, respectively.

Abstract: A robot wrist of an industrial robot having a wrist housing supporting two orthogonally arranged rotating output shafts therein, each of the shafts being connected to a robot hand, and a built-in fluid conveying means provided for distributing pressurized air introduced from the outside of the robot wrist toward the robot hand attached to one of the rotating cutput shafts. An output end of each of the two rotating output shafts may either be plugged by a plug element or closed by a stop valve when the output end is not connected to the robot hand.

Abstract: An industrial robot having a trunk mounted for vertical and rotational movement on a stationary base is provided with two arm members extensible from the said trunk having a robot wrist mechanism attached to their ends. The extending and contracting movements of the arm members, rotational movement of the wrist and swinging movement of the wrist are controlled, respectively, by three electric servo motors mounted in a mounting compartment positioned on the side of the trunk opposite to the extensible arms.

Abstract: A rotational angle detection device having two magnetoresistive sensing elements positioned at a 45.degree. angle with respect to each other senses the rotary position of a permanent magnet. Sine and cosine waves are applied to first and second bridge circuits respectively incorporating the two sensing elements. The resulting bridge circuit outputs are differentially combined to provide an output whose phase relative to either of the input sine or cosine waves is dependent upon the rotational position of the permanent magnet. The phase difference is detected and the rotational position is calculated therefrom.

Abstract: An industrial robot having a robot hand attached to a robot arm, a rotary motion unit supporting therein the robot arm, a vertical motion unit on which the rotary motion unit is disposed, and a vertical hollow structure extending through the vertical and rotary motion units and defining therein a vertically extending wiring and piping space.

Abstract: An industrial robot, having a manipulative robot hand for mounted on a vertically movable portion thereof moved by a vertical drive, provided with a load reducing pneumatic cylinder for applying a constant upward force to the vertically movable portion during the vertical movement of the portion and an air storage tank or tanks directly connected to the pneumatic cylinder for continuously supplying air under a desired fixed pressure. The upward force contributes to reducing a load applied to the vertical drive. The air storage tank or tanks contributes to ensuring mechanical rigidity of the industrial robot.

Abstract: A detergent composition contains as an active component a cellulase produced by alkalophilic bacteria of the genus of Cellulosmonas.

Abstract: A quick return beam splitter for a single lens reflex camera for directing the light from a picture-taking lens to both a viewfinder optical system and an AF optical system having a photoarray sensor when a focal plane shutter is not being operated is provided. The beam splitter has a metal reflecting film of high reflection factor partly deposited by evaporation on the surface of a glass substrate, and a dielectric material reflecting film of low reflection factor deposited by evaporation on the metal reflecting film.

Abstract: A wrist mechanism in an industrial robot comprises a wrist, a rotary type actuator which is rotatable in clockwise and counter-clockwise directions, a first positioning board which can define arbitrary angular stopping positions, sensing devices, and a second positioning board which is arranged facing the first positioning board, wherein the sensing devices detect the angular position of the wrist, which is driven by the rotary type actuator, the rotary type actuator is stopped by signals produced by the sensing devices, and the second positioning board with tapered receptacles is pressed to the first positioning board with tapered pins, whereby the positioning of the wrist mechanism is carried out.

Abstract: A wrist mechanism for an industrial robot having a robot casing, robot arms capable of extending from and contracting to the robot casing, a robot hand for gripping a workpiece, and a wrist arranged between the robot arms and the robot hand, comprises: two reduction gears with a high reduction ratio connected respectively to each of two high speed rotational driving motors, the two reduction gears cooperating with one another for generating two individual reduced rotational outputs, and; two transmitting mechanisms, connectable to the hand, for transmitting respectively the two reduced rotational outputs to the hand, thereby causing respectively rotational motion and swinging motion of the hand.

Abstract: This invention relates to a device for removing fused slags on slabs wherein <-shaped cutters with the front center thereof being the apex are disposed on the front and rear positions of a tool rest being vertically movable with a required spacing and being close to the undersurface of the slab, respectively. At least the rear cutter is biased upwardly by a spring mounted in the lower portion of the tool rest. At the same time the shear point in the rear cutter is made to be somewhat higher than that of the front cutter in order to cut out the fused slags deposited on the undersurface of the slab on a transferring roller table with a prescribed length. If it is arranged in such a way that a water-cooling means for water-cooling the deposited portion of the fused dross is disposed before and behind the above device for removing fused slags on slabs, respectively, to cut off the cured dross, the fused slags can more effectively be removed.

Abstract: Apparatus for removing a torch-cutting slag of a slab, wherein a cutting tool mount vertically and rotatably controllable is transversely racked beneath a conveying roller table for conveying the slab fusion-cut to a predetermined length in a direction perpendicular to the conveying roller table, and cutting tools for cutting the torch-cutting slag of the slab are provided at least at positions symmetrical with each other along the longitudinal outer surfaces of the cutting tool mount. The cutting tools for cutting the torch-cutting slag are constituted by a plurality of cutting tools arranged in succession from the center of the forward portion, i.e., the input side, to opposite sides of the rear portion of the cutting tool mount, the cutting tools are gradually increased in the level of projection from the forward portion to the rear portion on the cutting tool mount and are resiliently supported on the cutting tool mount through springs.

Abstract: An observing apparatus for observing if a mask for producing semiconductor circuit element and a wafer are aligned to a determined positional relationship. The apparatus is featured in eliminating the light reflected by the mask by the use of a phase mirror and an optical analyzer, thus allowing to observe the mask and wafer without difference in brightness.

Abstract: A beam splitter is disclosed which comprises a transparent substrate plate, a first dielectric thin film layer laid on the substrate, a metallic thin film layer laid on the first dielectric layer and a second dielectric thin film layer laid on the metallic layer. At least one of the first and second dielectric layers is composed of a plural number of dielectric substance layers having different refractive indexes. At least one of the dielectric substance layers is of a dielectric substance having a refractive index less than 1.80.

Abstract: Inductive heating apparatus includes serially connected first and second transistors which are alternately caused to conduct by a control circuit. A resonant circuit including an induction heating coil and a capacitor is connected in parallel with the second transistor. When the first transistor conducts a first current flows to charge the capacitor and when the second transistor conducts a second current flows in the resonant circuit to discharge the capacitor. The control circuit produces a turn-off signal to the conducting transistor before the current through the conducting current falls to zero and also produces a turn on signal to the nonconducting transistor when the current through the conducting transistor reaches zero.

Abstract: A phase shifting mirror comprising a thin film layer of metal provided on a substrate, and a thin film layer of dielectric material provided on said thin film layer of metal, wherein by utilization of a phase difference between a P-polarization reflected component and an S-polarization reflected component resulting from the reflection on the boundary surface between the layer of metal and the layer of dielectric material and variations in refractive index and film thickness of the dielectric material, a desired phase difference is obtained between the P-polarization reflected component and the S-polarization reflected component.

Abstract: A magnetic rotary encoder for detecting incremental angular displacement, angular velocity and rotating direction using magneto-resistors is disclosed. A drum, disk or cupshaped rotary member is attachable to a rotatable shaft. A magnetic medium is provided on a surface of the rotary member and is divided at a pitch p into a plurality of magnetic sections each of which has a magnetic signal recorded. The magnetic medium produces an alternating magnetic field as the rotary member revolves. Alternatively, a plurality of permanent magnets are provided on the surface of the rotary member to produce the alternating magnetic field of the rotary member revolves. A magnetic field detector includes at least one magneto-resistor having a stripe-like configuration with width D. The magneto-resistor is located in the vicinity of the rotary member so as to be spaced from the magnetic medium or the permanent magnets by equal to or less than p at its nearest portion and by equal to or less than 20p at its furthest portion.