Abstract: A suspension (1a) includes a plurality of roll sections (1b) each of which has a semicylindrical shape in a cross section. The roll sections (1b) are disposed side by side based on a straight line connecting two points on an inner periphery or an outer periphery. The roll sections (1b) form a closed loop in a manner that a roll section (1b) of the roll sections (1b) being disposed first adjoins a roll section (1b) of the roll sections (1b) being disposed last. Adjacent roll sections (1b) are coupled with each other through a boundary section (2) forming a continuous three dimensional curved surface. A linearity of compliance improves, and generation of distortion or rolling is restricted using the suspension (1a).

Abstract: The present invention provides a loudspeaker capable of matching a sound image and a picture image on a screen of an image reproducer with each other in simple construction and a simple method of installation. The loudspeaker is located above the image reproducer in the vicinity thereof and so constructed as to reproduce a center channel signal in a multichannel sound signal for a movie or the like as a principal object, which comprises a main speaker unit, particular band preventing means for suppressing the level of a particular band in a band of not less than approximately 4 kHz of the main speaker unit, a sub-speaker unit, particular band passing means connected to the sub-speaker unit for passing only the particular band, and a dispersing device located on a front surface of the sub-speaker unit and so constructed that a reproduced sound radiated from the sub-speaker unit is mainly composed of a diffused sound.

Abstract: A surface acoustic wave device which reflects a surface acoustic wave is provided. The reflector of the surface acoustic wave device includes electrode fingers. The electrode fingers are disposed at predetermined intervals d, and are divided into five groups by the width. The widths w of the electrode fingers are varied between widths w1, w2, and w3, so that the reflectance becomes similar to the Hamming function.

Abstract: A dome speaker comprising a dome-shaped diaphragm formed of a highly rigid material such as titanium or a titanium alloy, and having at least one elongated cut-out portion which varies the rigidity of the diaphragm and prevents a dip in the anti-resonance frequency range and a peak in the high resonance frequency range of the dome speaker. The speaker also includes a voice coil bobbin connected to the diaphragm. Preferably, the diaphragm includes two elongated cut-out portions in parallel relation to each other and with a center portion of the diaphragm interposed therebetween. A reinforcing rib may be integrally formed at an end of each cut-out portion. The cut-out portion may be covered either by a peripheral member made of a soft material or by a loss stopper formed of a viscoelastic material.

Abstract: A structure for a dome speaker includes a dome-shaped diaphragm formed of a high rigidity material and having an outer periphery, a voice coil bobbin secured at a top end thereof to the outer periphery of the diaphragm, a voice coil mounted about the bobbin, and a variation means in the bobbin for varying the resonance conditions of the diaphragm. The variation means includes at least one cut-out portion provided at the top end of the bobbin and a sheet which closes the cut-out portion. Preferably, the diaphragm is made of a nitrified titanium alloy and the sheet is made from a material softer than the bobbin. The cut-out portion may have a width from about 7 to about 50 percent of the total circumferential length of the bobbin.