摘要:
A SAW duplexer includes a first SAW filter having a passband with a relatively low frequency, and a second SAW filter having a passband with a relatively high frequency. The first and second SAW filters each have a ladder-shaped circuit configuration. A bridging inductor is connected in parallel to at least one serial arm resonator in the second SAW filter. The bridging inductor includes a coiled portion provided on a multilayer package substrate. The coiled portion is defined by connecting first to third wires provided on first to third layers by via-hole conductors. First, third, and fifth via-hole conductors that define a coil return wire portion are disposed inside the coiled portion.
摘要:
A SAW duplexer includes a first SAW filter having a passband with a relatively low frequency, and a second SAW filter having a passband with a relatively high frequency. The first and second SAW filters each have a ladder-shaped circuit configuration. A bridging inductor is connected in parallel to at least one serial arm resonator in the second SAW filter. The bridging inductor includes a coiled portion provided on a multilayer package substrate. The coiled portion is defined by connecting first to third wires provided on first to third layers by via-hole conductors. First, third, and fifth via-hole conductors that define a coil return wire portion are disposed inside the coiled portion.
摘要:
A method for manufacturing a surface acoustic wave element that prevents curvature of a piezoelectric substrate when forming an electrode pattern includes a first step of bonding to a first principal surface of a piezoelectric substrate a support member having a linear expansion coefficient lower than a linear expansion coefficient of the piezoelectric substrate to form a composite substrate, a second step of forming a plurality of grooves in the support member of the composite substrate from a surface that is opposite to a bonding interface between the support member and the piezoelectric substrate, a third step of forming electrode patterns including at least one IDT electrode on a second principal surface of the piezoelectric substrate of the composite substrate, and a fourth step of dividing the composite substrate on which the electrode patterns are formed to form individual surface acoustic wave elements.
摘要:
A surface acoustic wave device includes a surface acoustic wave element mounted on a substrate, and the surface acoustic wave element is sealed by a resin sealing layer. Even when the size of the surface acoustic wave element is reduced, a short circuit in a mounting electrode is prevented from occurring when it is mounted, a fillet formation of a conductive bond in the mounting can be easily and visually checked, and the cost can be reduced. The surface acoustic wave element is mounted on a multi-layered substrate by a face-down mounting method by using bumps, the surface acoustic wave element is sealed by the resin sealing layer, electrode lands on an upper surface of the multi-layered substrate connected to the bumps are connected to internal electrodes through via hole electrodes, and the internal electrodes are electrically connected to the mounting electrodes on a lower surface of the multi-layered substrate and end surface wiring electrodes.
摘要:
A transmission elastic wave filter element and a reception elastic wave filter element each flip-chip mounted to a principal surface of a substrate are sealed off by a sealing member. The sealing member includes a base portion in contact with the principal surface of the substrate and made of a first dielectric material, and a lower dielectric-constant portion made of a second dielectric material having a dielectric constant lower than that of the first dielectric material and arranged in at least one of a region of the sealing member that faces the transmission elastic wave filter element on a side opposite from the substrate with respect to the transmission elastic wave filter element, and a region of the sealing member that faces the reception elastic wave filter element on the side opposite from the substrate with respect to the reception elastic wave filter element.
摘要:
According to the present invention, a cylindrical side wall is provided in a housing so as to surround an outer periphery of a stopper member. Further, an end surface of the side wall is higher than a top surface of outermost periphery of the stopper member. Oil otherwise scattered is received by the side wall for collection. Oil is thus prevented from scattering even if during manufacturing, the amount of oil dripped between the shaft and the oil-impregnated bearing is not strictly controlled, so that a slightly excessive amount of oil is dripped. Therefore, the present motor device enables manufacturing operations to be favorably performed, and is reliable having a long lifetime.
摘要:
A method for manufacturing a langasite single crystal substrate comprises the steps of polishing at least one of the main surfaces of a raw material substrate; and wet-etching said polished main surface of the substrate with a solution including H3PO4, HNO3 and CH3COOH.
摘要翻译:一种用于制造朗氏单晶基板的方法包括以下步骤:抛光原料基板的至少一个主表面; 并用包含H 3 PO 4,HNO 3和CH 3 COOH的溶液湿蚀所述抛光的基底的主表面。
摘要:
A spindle motor unit having a hydrodynamic bearing that retains a necessary amount of lubricant in the thrust bearing even when rotating and stopping operations are frequently repeated, and ensures reliability of the bearing, and allows correct recording and reproducing operations is obtained by reducing the clearance formed between the inner diameter surfaces 11d and 11e of base 11 and the outer diameter surface of flange 13.
摘要:
In order to not only obtain excellent sound quality in a long-time recording mode not less than five times a standard recording mode by preventing, without narrowing a track pitch of a high-fidelity head, the high-fidelity head from tracing the third sound track from a target sound track as well as excellent picture quality free from crosstalk from an adjoining video track of a target video track but enable special playback without using a field memory in a video tape recorder, one head pair in conventional double azimuth type four heads for the standard recording mode and a threefold recording mode is used for video recording in the long-time recording mode and a head pair having a head width smaller than a width of a recording track is used exclusively for video playback in the long-time recording mode.
摘要:
A method for manufacturing a surface acoustic wave element that prevents curvature of a piezoelectric substrate when forming an electrode pattern includes a first step of bonding to a first principal surface of a piezoelectric substrate a support member having a linear expansion coefficient lower than a linear expansion coefficient of the piezoelectric substrate to form a composite substrate, a second step of forming a plurality of grooves in the support member of the composite substrate from a surface that is opposite to a bonding interface between the support member and the piezoelectric substrate, a third step of forming electrode patterns including at least one IDT electrode on a second principal surface of the piezoelectric substrate of the composite substrate, and a fourth step of dividing the composite substrate on which the electrode patterns are formed to form individual surface acoustic wave elements.