Abstract:
PURPOSE:To excellently measure the speed of an object to be measured without using any phase adjusting circuit nor delay line. CONSTITUTION:In an optical Doppler speedometer which measures the speed of an object 1 to be measured based on photodetecting signals having the frequency-modulated component corresponding to sine-wave modulating signals by obtaining a measuring light beam LA from reflected light from the object 1 by projecting a light beam emitted from a light source 2 upon the object 1, a reference light beam LB by making the light beam from the light source 2 incident to an optical modulator 7 which makes modulating operations by using the sine-wave modulating signals, and the photodetecting signals by detecting synthesized light containing the light beams LB and LA with a photodetecting means 13, the photodetecting signal is AM-demodulated by using two synchronized pilot signals F1 and F2 having different frequencies.
Abstract:
PURPOSE:To enable a device to be miniaturized by simplifying a signal- processing circuit system and reducing a size of a substrate, and enable an unneeded signal which is generated halfway through the signal processing to be eliminated, and sensitivity for detecting speed to be improved. CONSTITUTION:A light beam is emitted to an object to be measured for obtaining its reflection light and at the same time the light beam is input to phase modulators 23 and 24 where sinusoidal signals with different frequencies are applied, thus obtaining first and second reference lights. A laser Doppler speed meter 20 is constituted so that two synthesized lights which are obtained by allowing a reflection light to be synthesized to the first and second reference light are converted to a light-detection signal by light-detection means 29 and 30 and a speed of the object to be measured is measured based on a sum of these lightdetection signals.
Abstract:
PURPOSE:To decrease an optical propagation loss by heat treating an oxide optical crystal base body having an optical waveguide in an atmosphere contg. ozone. CONSTITUTION:The optical waveguide 2 is formed by diffusion of various kinds of atoms or an ion exchange or proton exchange on one main surface of the oxide optical crystal base body 1 consisting of, for example, LiNbO3, etc. The base body is heat treated in the atmosphere contg. ozone O3 in such a manner, by which the propagation (guiding) loss of the optical waveguide 2 is decreased. The insertion loss of, for example, devices for communication and sensing is decreased and the S/N of the signal is increased.
Abstract:
PURPOSE:To enable accurate speed measurement by controlling an amplitude and a phase of a signal corresponding to a modulation signal to a light modulator to remove a unnecessary frequency component contained in a signal before a demodulation by a specified computation. CONSTITUTION:An amplitude and phase of a signal corresponding to a modulation signal to a light modulator 12 of a laser Doppler speedometer 1 via a driving circuit 22 are added to a signal subjected to a required adjustment with a variable amplifier 31 and a phase shifting circuit 32 and a signal before a demodulation via a signal processing circuit 30. An unnecessary frequency component contained in the signal before the demodulation is removed to be demodulated with an FM demodulation circuit 34 thereby enabling accurate measurement of a speed of an object to be measured.
Abstract:
PROBLEM TO BE SOLVED: To provide an electroacoustic transducer, an array electroacoustic transducer apparatus, and an electroacoustic transducer system which are manufactured without complicating the processes.SOLUTION: An electroacoustic transducer includes: a first spacer; a second spacer; a diaphragm having an outer peripheral part supported by the first spacer and the second spacer; a first base material where a first electrode is formed on at least a part of a main surface facing the diaphragm; and a second base material where a second electrode is formed on at least a part of a main surface facing the diaphragm. The facing surface of the first base material which faces the diaphragm is formed so as to protrude toward the diaphragm relative to a surface of the first electrode and the facing surface of the second base material which faces the diaphragm is formed so as to protrude toward the diaphragm relative to a surface of the second electrode.
Abstract:
PROBLEM TO BE SOLVED: To successfully obtain broadband voice output. SOLUTION: A hybrid actuator 100A has a magnetostrictive actuator 110 having a magnetostrictor 111 and a movable coil type actuator 130 in which voice coils 131a, 131b are attached to the periphery of a movable part 132. The actuator 110 is fixed to the movable part 132 of the actuator 130 so that the direction of displacement output of a drive rod (displacement transmitting part) becomes the same as the displacement direction of the movable part. Displacement output concerning a low-pass voice signal by the actuator 130 is also obtained by fixing the actuator 110 to the movable part 132 of the actuator 130 together with the displacement output concerning a high-pass voice signal by the actuator 110 to the tip of the drive rod 113. The broadband sound output is obtained by abutting the tip of the drive rod 113 on an acoustic diaphragm. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide the speaker apparatus which can obtain proper voice signals. SOLUTION: A driving rod 103a of an actuator 103 is attached to the lower end surface of a pipe 102. The actuator 103 is driven by the low-frequency component of a voice signal for vibrating the pipe 102 from the lower end surface of the pipe 102 with a component of the vibration, in a direction that is orthogonal to this end surface (in the direction of the surface). A voice output with a high-frequency component is obtained from the side surface of the pipe 102. A speaker unit 104 is driven by the low-frequency component of a voice signal. Sound wave of positive phase outputted from a front surface of the unit 104 is radiated to the outside from a bottom surface of a base casing 101. Sound wave of negative phase outputted from the back surface of the unit 104 is radiated to the outside from the upper end of the pipe 102 through an opening 105 and the pipe 102. The pipe 102 acts as an acoustic diaphragm at high-frequency band and acts as a resonance tube at low-frequency band. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To efficiently radiate a sound signal. SOLUTION: A diaphragm 102 made of an electrostrictive flexible polymer is attached on an opening end 101a of a chamber 101. Electrode layers 104F and 104R each capable of adjusting its shape in accordance with a change in shape of the diaphragm 102 are each provided on the front and backsides of the diaphragm 102. The diaphragm film 102 is molded into a convex shape in which a difference in atmospheric pressure between the front and backsides is the maximum. In molding, a gas is continuously put into the inside of the chamber 101, and, when the difference in atmospheric pressure between the inside and outside of the chamber 101 becomes the maximum, putting of the gas is completed. A sound signal voltage biased at a DC bias vias is applied to the electrode layers 104F and 104R. Shrinkage of the diaphragm 102 in a surface direction, i.e. vibration of the diaphragm 102 in a thickness direction occurs in response to the sound signal, and the sound signal is radiated. Since the diaphragm 102 is molded into a convex shape in which the difference in atmospheric pressure becomes the maximum, the reproducible maximum sound pressure is large and the sound signal can be efficiently radiated. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an electric machine converter by which one of the outputs or a mixture output both of the vibration output and the voice output are easily obtained with a small scale structure using a magnetostriction actuator. SOLUTION: The drive signal Sd is supplied from the voice treatment part 108 to the magnetostriction actuator 109. The magnetostriction actuator 109 is allowed to contact with a part of an enclosure 120, for example, a liquid crystal acrylic panel. In case of telephone communication, the drive signal Sd corresponding to the voice signal of the telephonic communication is supplied to the magnetostriction actuator 109 to obtain the telephonic communication voice. At the time of arrival of the communication, the drive signal Sd corresponding to one of the signals among the voice signal for the arrival of the communication and the vibration signal or the drive signal Sd of their mixture signal is supplied to the magnetostriction actuator 109 in accordance with the on-off in manners mode and the on-off in the vibration to obtain one of the outputs of the voice output (voice of arrival of communication) and the vibration output or both the mixture output. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a disk reproducing device wherein a copy right protection function is strengthened. SOLUTION: Dynamic balance during disk rotation is lost by applying weight on one surface of a disk or changing an air resistance during the disk rotation. Thus, during the disk recording medium rotation, for example, surface fluctuation occurs larger than a focal depth in the thickness direction of the disk. Therefore, in the disk recording medium, during rotation exceeding a predetermined rotational speed, for example, focusing on the disk recording medium by the reproducing device is made impossible, and its reproduction is made impossible. COPYRIGHT: (C)2003,JPO