Abstract:
PURPOSE:To surely decrease return light quantity to unrequired reflected light from a substrate end face and to simplify the manufacture of the optical waveguide device by providing the side plane on the light incident side of an optical guidewave inner than the end face on the light incident side of a substrate. CONSTITUTION:The end face 2A on the light incident side of the optical waveguide 2 is formed at the side inner than the end face 1A of the substrate 1. In other words, when light from the light source of a laser beam, etc., is coupled with the optical guidewave 2, the focal point P of a lens 16 is positioned at the end face 2A of the optical guidewave 2, not at the end face 1A of the substrate 1, and light Li from the light source 17 is focused on the end face 2A of the optical guidewave 2. Therefore, reflected light Lo from the substrate end face 1A is diverged without being returned to the light source 17 by the lens 16 after being focused on a position Pi symmetric to the focal point P as for the end face 1A, which decreases the return light quantity to the light source 17. Also, it is possible to surely decrease the return light by setting a gap between the end face 2A of the optical waveguide 2 and the end face 1A of the substrate 1 between 50-500mum.
Abstract:
PURPOSE:To measure the velocity of a high speed measured object precisely and accurately with a simple and small device by multiplying sine wave signals to a signal obtained by interfering a reference light with a measuring light having different phases. CONSTITUTION:A measuring light L3 emitted out of a laser source 3 and reflected by a speaker 2 on a measured object and two referrence lights L2A, L2B with shifted phases by 90 degrees which are separated by way of a spectroscopic means consisting of a polarizer 4, a beam splitter 5, a 1/8 wavelength plate 6 and a fixed mirror are interfered to make interfered lights L4A, L4B. These lights are introduced into light reception elements 9, 10 by way of a polarization beam splitter 8 to obtain detection signals S1, S2 by square-low detection to which sine wave reference signals S3, S4 having a determined frequency omega1 are multiplied 12, 15 to output multipled signals S5, S6. Then the signals S5 and S6 are added to output a frequency-modulated signal S7 to an Fm demodulating circuit 17 and a measured output corresponding to the vibration velocity of the vibration surface of the speaker 2.
Abstract:
PROBLEM TO BE SOLVED: To enlarge a listening range in a high sound area.SOLUTION: A speaker system includes: a first speaker unit 3 having a prescribed angle of beam spread in a horizontal direction; and a pair of second speaker units 4, 4 arranged on the mutually opposing sides of the first speaker unit in a vertical direction, and having an angle of beam spread in a horizontal direction, which is larger than that of the first speaker unit. Distances from a center P1 of the first speaker unit to centers P2, P2 of the pair of second speaker units are set to be the same, and also the first speaker unit and the pair of second speaker units are arranged to face in the same direction.
Abstract:
PROBLEM TO BE SOLVED: To achieve a desired sound image localization and a spread feeling with a simple configuration speaker device not depending on only a diaphragm shape.SOLUTION: An acoustic diaphragm 201 made of a material having a physical anisotropy and formed in a predetermined shape, and an actuator 208 attached to the acoustic diaphragm 201 in order to excite a vibration component with a direction corresponding to a physical anisotropy taken into consideration are provided. Therefore, since the vibration component can be excited in the direction corresponding to the physical anisotropy, the sound wave surface shape and frequency characteristics of a sound pressure level radiated from the acoustic diaphragm 201 are changed to obtain a desired sound image localization and the spread feeling compared with an acoustic diaphragm made of material having a physical isotropy.
Abstract:
PROBLEM TO BE SOLVED: To provide an audio outputting device capable of attaining a thinner display screen and moving the localization position of an audio image in the height direction of the screen without degrading tone quality, and to provide a video/audio reproducing apparatus and an audio outputting method. SOLUTION: The audio outputting device includes a dividing part 121, a delay processing part 122, a frequency adjusting part 125, first outputting units 151 and 152, and second outputting units 153 and 154. The dividing part 121 divides an input audio signal input into a first audio signal and a second audio signal. The delay processing part 122 delays the first audio signal from the second audio signal by only a predetermined amount, and outputs it. The frequency adjusting part 125 adjusts frequency bands of the second audio signal so that the frequency bands of the second audio signal are composed of frequency bands on the high frequency side in the first audio signal or frequency bands on the frequency side higher than that of the first audio signal. The first output units 151 and 152 are arranged at upper or lower level from the screen of the display for displaying a video image, and output the first audio signal input from the delay processing part. The second output units 153 and 154 arranged at the level equal to or higher than the screen height center of the display, and output the second audio signal adjusted by the frequency adjusting part. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To obtain a constantly-suitable magnetostrictive characteristic, and to obtain constant sound quality and a constant sound volume. SOLUTION: In a speaker apparatus, a magnetostrictive actuator 30 and a coil spring 51 are inserted into a storage part 23 which is a hole vertically penetrating a base housing 20, and furthermore, a screw 52 is inserted up to a position where the tip of a driving rod 35 of the magnetostrictive actuator 30 is abutted on a lower end face 12 of an acoustic diaphragm 10 and the coil spring 51 is compressed by a prescribed quantity. The shrinkage amount of the coil spring 51 is set to an amount by which a sum of a preload F1 applied to a magnetostrictive element 31 in the magnetostrictive actuator 30 and a load F2 applied to the magnetostrictive element 31 by the coil spring 51 becomes an optimum value and an optimum magnetostrictive characteristic (a characteristic that a magnetic field range in which a magnetostrictive value is linearly changed in a change of a control magnetic field becomes the widest range and a change in the magnetostrictive value in the change of the control magnetic field in the magnetic field range becomes the largest change). COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To excellently perform bass register reproduction with a short sound tube length without any trouble caused by a higher resonance frequency. SOLUTION: A speaker system 100A comprises a speaker 101, and a first sound tube 102 and a second sound tube 104 fitted to the back of the speaker 101 in order. The cross section of the sound tube 104 is made smaller than that of the sound tube 102 and the fundamental resonance frequency of a composite sound tube 106 is made lower than the fundamental resonance frequency of a sound tube which is uniform in cross section and equal in length to the composite sound tube 106. The ratio of the length of the sound tube 104 to the length of the sound tube 102 is specified, at least a second resonance frequency or third resonance frequency of the composite sound tube 106 is made higher than a corresponding resonance frequency of the sound tube which is uniform in cross section and equal in length to the composite sound tube 106, and a higher resonance frequency of the composite sound tube 106 is made to deviate from a frequency which is an integral multiple of the fundamental resonance frequency of the composite sound tube 106. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To obtain more satisfactory noise cancellation effects. SOLUTION: A conductor part structured to have electric resistance ratio less than that of magnetic body materials configuring a magnetic circuit is arranged near the voice coil of a driver unit so that electromagnetic induction coupling can be generated between the voice coil and the conductor part, and that the inductance of the voice coil can be reduced. The reduction of the inductance of the voice coil reduces a phase difference between a driving voltage to be applied to the voice coil and driving currents corresponding thereto. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To attain improvement in sound quality when obtaining an audio output by driving a diaphragm with a magnetostriction actuator. SOLUTION: A diaphragm 106 is driven by a magnetostriction actuator 105. As a sensor, a piezoelectric element 107 is disposed between a distal end of a driving rod 153 and the diaphragm 106. The piezoelectric element 107 detects vibration of the diaphragm 106 and outputs a vibration detecting signal. The vibration detecting signal contains information of distortion that occurs in the actuator 105, the diaphragm 106 and the like. An equalizer 102, a subtractor 103, a phase correction circuit 108 and a low-pass filter 109 constitute a correction section. The correction section performs feedback correction upon an audio signal from a signal source 101 based on the vibration detecting signal. The corrected audio signal can correct the distortion that occurs in the actuator 105, the diaphragm 106 and the like, so that the vibration of the diaphragm 106 highly accurately complies with a waveform of the audio signal outputted from the signal source 101, thereby attaining improvement in the sound quality of output audio. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To simply and successfully perform reinforcement of a diaphragm of a speaker system. SOLUTION: In the speaker system equipped with a diaphragm 20 for a speaker which is constituted by connecting a dome-like diaphragm 21 with an edge-like diaphragm 22 and oscillated using a voice coil and a ring 30 for reinforcement which reinforces a connection flat part or near the connection flat part of the diaphragms, the ring 30 for reinforcement is formed by a material having permeability and the ring 30 for reinforcement having the permeability is adhered to the connection flat part or near the connection flat part of the diaphragm 20. COPYRIGHT: (C)2006,JPO&NCIPI