Abstract: A method of fabricating an optical switch including a stationary support member, a movable support member, and at least one pair of optical fibers, the pair of optical fibers being supported on the stationary and movable support members, respectively, so that an optical path between optical fibers is changed by moving the movable support member. The method comprises the steps of preparing a guide with V-shaped grooves, securing at least one optical fiber element on the surface of the guide, bridging and fixing the guide on the stationary and movable support members, and separating the guide along at least a line extending between the stationary and movable support members. Thus, the guide and the optical fiber element is separated into a first part supported by the stationary support member and a second part supported by the movable support member, to constitute the optical switch having at least one pair of optical fibers.

Abstract: A magnetic field sensor for an acceleration sensor including a cantilever beam having a free end to which a permanent magnet is attached. A pair of the magnetic sensors, each consisting of a barber-pole type magnetoresistive sensing element, are arranged opposite to and symmetrically. The cantilever is bent and the magnet is moved according to an acceleration, which is detected as outputs from the magnetoresistive sensing elements.

Abstract: A sensing device for measuring electric current and electric power including a plurality of magneto-electric transducers for detecting a magnetic field about a conductor carrying the electric current. The magneto-electric transducers can include Barber-Pole type elements, each element being positioned on a substrate at approximately the same distance from the central point of a substrate.

Abstract: An optical fiber of heat resistance, low-temperature resistance, flexural resistance, water absorption resistance, chemical resistance, etc., is provided by comprising a composition in which a core component comprises a polycarbonate or a silica type glass, a clad component comprises a graft-modified poly (4-methyl-1-pentene).

Abstract: An acceleration sensor including a cantilever beam having a free end to which a permanent magnet is attached. A pair of magnetic sensors, each comprising a barber-pole type magnetoresistive sensing element, is arranged in symmetrically spaced and opposed relationship and in a common plane extending parallel to the magnetic flux of the permanent magnet with respect to respective, opposite sides of the magnet. The cantilever is bent and the magnet is moved accordingly in response to an acceleration force, which is detected as outputs from the magnetoresistive sensing elements.

Abstract: A position detector having a magnetic sensor for measuring linear or angular displacement, or detecting a position of a body without contact thereto. The detector has a closed circuit including magnets and yokes. The magnetic leakage flux which emanates from the inside surfaces of the yokes is utilized to detect the position of the body. The magnetic sensor is transferred along the inside surfaces of the yokes by a transferring circuit, which senses the magnetic field intensity of the leakage flux distributed thereon. This enables the detector to have a longer measuring range than that of a prior art detectors. An output signal is stable due to the shielding effect of the yokes. The magnetic closed circuit has many magnetic and mechanical configurations. For example, for the magnet, a permanent magnet and an electromagnet can be used.

Abstract: An illuminating apparatus which comprises a plane board composed of a transparent resin having an organic fluorescent dye incorporated therein and a light-reflecting member arranged on at least a part of the back surface of the plane board, wherein a light incident from at least a part of the end face of the plane board is emitted from at least a part of the surface of the plane board.

Abstract: A piezoelectric resonator with a rectangular parallelepiped resonator. A lithium niobate single crystal is used as the resonator chip material. Each of the opposed main surfaces of the resonator chip is arranged to be a surface of a rotated Y-cut plate which is rotated 165.+-.5 degrees about an X-axis. The angle of the longitudinal direction of the resonator chip is arranged to be 90.+-.5 degrees with respect to the X-axis of the rotated Y-cut plate.

Abstract: A surface acoustic wave device comprising a first set of interdigital electrodes that generate surface acoustic waves, a second set of interdigital electrodes that receive and convert surface acoustic waves into electrical signals, and an intermediate electromechanical coupling element provided therebetween. The coupling element comprises a plurality of parallel strips formed on the surface of a piezoelectric substrate such as to receive and change the direction of propagation of the surface acoustic waves, each of these parallel strips being spaced at a predetermined distance from each other and connected therebetween in a given manner to obtain suitable stopband characteristics.

Abstract: A piezoelectric resonator chip which includes a piezoelectric chip plate and a pair of electrode patterns which is formed on the opposite surfaces of the piezoelectric chip plate, the electrode patterns face each other through the piezoelectric chip plate. At least one of the electrode patterns has an adjuster pattern which includes a narrow cutting pattern and a separation pattern which is connected to the electrode pattern through the cutting pattern and which faces the other electrode pattern.

Abstract: A piezoelectric resonator which resonates in thickness shear mode. The piezoelectric resonator includes a strip shaped resonance chip made of an X-cut plate of lithium tantalate crystal and having a rectangular cross-section. Electrodes are formed at the center portion with respect to the longitudinal direction of the resonance chip on each of two X-plane surfaces. The width of the electrodes is equal to the width of the resonance chip. The longitudinal direction of the resonance chip inclines with respect to the Y-axis by an angle of 50.degree..+-.2' in the clockwise direction in the X-plane so as to make the longitudinal direction of the resonance chip coincide with the displacement direction of primary oscillation of the crystal. Optimal ratios of the dimensions of the resonance chip and terminal connectors at the ends of the resonance chip are given to reduce spurious response.

Abstract: An acoustic surface wave device comprises a piezoelectric substrate (1), an input transducer (2), an output transducer (3) and acoustical absorbent layer patterns (5, 6) for absorbing undesired acoustic surface waves and bulk waves (S.sub.4, S.sub.5). Each of the acoustical absorbent layer patterns (5, 6) has zigzag-shaped or triangular shaped edges, i.e., a recess portion (R.sub.1, R.sub.3) and a protruding portion (R.sub.2, R.sub.4). The recess portion has a further recess portion (R.sub.1 ', R.sub.3 ') which is formed diagonally with respect to the propagation path of acoustic surface waves.

Abstract: A surface acoustic wave filter which comprises: a substrate of piezoelectric material; a multistrip coupler for changing the track of a signal comprising a plurality of parallel conductive strips; at least two transducers disposed on one side of the multistrip coupler; at least another two transducers disposed on the other side of the multistrip coupler. The latter two transducers facing the former two transducers. One pair of the transducers which face each other through the multistrip coupler constitutes input transducers while the other pair of the transducers constitutes output transducers.

Abstract: An acoustic surface wave device comprising: a piezoelectric substrate; a pair of input and output transducers located diagonally from each other; and a multistrip coupler between the two transducers. In this device, the spacing of electrodes of at least one of the transducers is 3.lambda./4 (.lambda.: wavelength of the acoustic surface waves) and, accordingly, the resulting spurious frequency response is excluded by using the transfer characteristics of the multistrip coupler.

Abstract: A surface acoustic wave device comprises a piezoelectric substrate, and an input transducer and an output transducer formed on the substrate. Dummy transducers are formed on the substrate and arranged to extend from the ends of the input and output transducers toward the ends of the substrate. The dummy transducers individually include electrodes spaced at the same pitch as the electrode pitch in the input and output transducers. Accordingly, there is no occurrence of reflections of the surface acoustic wave at the ends of the input and output transducers.

Abstract: A surface acoustic wave device comprising a piezoelectric substrate, an input transducer and an output transducer arranged diagonally to each other. A multistrip coupler is interposed between the input and output transducers. A reflecting transducer is placed opposite to the input transducer with the multistrip coupler therebetween. The multistrip coupler includes an adjusted number of conductors. The reflecting transducer includes weighted electrodes, and means for adjusting phase difference, whereby the surface acoustic waves reflected by the output transducer and the reflecting transducer are cancelled by each other. Accordingly, triple transit echo (TTE) can be suppressed without use of external variable resistors and inductors.

Abstract: A method of manufacturing an acoustic surface wave device comprising: forming two pairs of transducers, a multistrip coupler and lead patterns for electrically shorting at least one pair of the transducers on a piezoelectric material; mounting the piezoelectric material on a package base having pins; bonding the electrodes of the opened transducers to the pins by wires, and; testing the device by applying and obtaining signals of the opened transducers through the pins. In this manufacturing method, testing is carried out without using probing technology.

Abstract: A surface acoustic wave filter device in which a capacitative coupling means is provided to couple at least one of the terminals of the SAW input transducer to at least one of the terminals of the output transducer, in order to equalize the levels of signals which are induced on the pair of output terminals of said output transducer without assuming the form of surface acoustic waves. The stray inductive coupling which normally occurs between the input and output terminals of the SAW filter degrades filter performance. Since the inductive coupling to the two output terminals is normally unequal, the inductively coupled unfiltered signals cannot be completely rejected by a balanced differential amplifier. By equalizing the levels of unfiltered signals at the output terminal, effective rejection by a differential amplifier is possible.