Abstract: The present invention relates to a machine tool (11) for machining a large-sized workpiece (89) such as aircraft parts mounted on a workpiece mounting table (99), by moving a spindle having a tool mounted thereon in directions along the X-axis, the Y-axis and the Z-axis. The machine tool (11) can provide a highly efficient, high-speed and highly precise machining for a large-sized workpiece (89) and solve a problem of a compact installation area. In order to solve this problem, according to the present invention, a workpiece support structure (15) is disposed in opposed relation to a spindle support structure (13) which a spindle head (73) movable in the directions along the X-axis, the Y-axis and the Z-axis. The workpiece mounting table (99) of the workpiece support structure (15) is provided with pallet securing means on two opposed pallet mounting surfaces thereof and is supported to allow for rotational indexing about a horizontal axis extending in the direction along the X-axis.

Abstract: An eyeglass lens processing apparatus for processing a periphery of an eyeglass lens, includes: a lens rotating unit having rotating shafts for holding and rotating the lens; an abrasive wheel; an abrasive wheel state detecting unit for detecting a lowered processing performance of the abrasive wheel; and a notifying unit for notifying that dressing for the abrasive wheel is required based on a result of detection by the abrasive wheel state detecting unit.

Abstract: An eyeglass lens processing apparatus for processing a periphery of an eyeglass lens, includes: a lens rotating shaft which holds and rotates an eyeglass lens to be processed; an abrasive wheel rotating shaft movable between a retracted position and a processing position; a chamfering abrasive wheel which is attached to the abrasive wheel rotating shaft and which chamfers the lens while receiving a processing load from the lens during processing; a detecting unit which detects the load to the chamfering abrasive wheel; and a control unit which issues a control signal for relatively moving the lens and the chamfering abrasive wheel one from another to reduce the processing load if the detected processing load is higher than a predetermined first level and for continuing the chamfering, and which issues a control signal for ending the chamfering if the detected processing load over the entire periphery of the lens is lower than a predetermined second level.

Abstract: In order to detect microwaves from radar type speed measurement devices and microwaves leaking out of reverse detectors without being detected by such reverse detectors, a microwave detector is provided with a super-heterodyne type reception circuit for cyclically performing reception operations to receive target microwave frequencies of prescribed microwave bands, the reception circuit including a first local oscillator which can carry out a fixed oscillation at a prescribed frequency or a sweep of a prescribed frequency range established slightly outside the frequency range of the local oscillator of a reverse detector, and a plurality of second local oscillators having different oscillation frequencies, whereby the reception circuit is able to receive microwaves in the target bands and microwaves leaking out of the local oscillator of a reverse detector.

Abstract: A method of correcting digital NTSC color-television signals in transmission error by substituting the error-included digital color-television signals with those digital color-television signals in the corresponding horizontal scanning periods two frame periods before, stored in memory (12), and an apparatus to work the method. When a transmission error is detected in a specific horizontal scanning period, substitute circuit (13) reads from memory (12) the digital color-television signals in the N horizontal scanning periods two frame periods before corresponding to the specific and subsequent N-1 horizontal scanning periods, and transmits the digital color-television signals read from memory (12) in lieu of those digital color-television signals in the specific and subsequent N-1 horizontal scanning periods.

Abstract: An optical waveguide which has properties including low optical losses, facile fabrication, controllable core-cladding refractive index ratio, and a high heat resistance is provided. The optical waveguide for light transmission therethrough has a core made of a polyimide obtained from at least one tetracarboxylic acid dianhydride and at least one diamine. The polyimide is (a) a polyimide homopolymer derived from a diamine represented by formula [I] as follows: ##STR1## (b) a polyimide copolymer derived from at least one diamine including the diamine represented by the formula [I]; or (c) a mixture of the polyimide homopolymers.

Abstract: A steering wheel core material of continuous filament FRP for vehicles which is made up of a ring, a boss positioned at the center of the ring, and spokes connecting the boss to the ring, said boss being integrally joined to a boss metal fitting. It is formed by winding resin-impregnated continous filaments in layer around the ring- and spoke-forming mold and the body of the boss metal fitting, with an elastic material interposed between the body of the boss metal fitting and the FRP.