摘要:
A display device and an electronic equipment having a high reproduction quality can be provided without hampering the scalability or the portability of the display device and the electronic equipment. A notebook computer includes a main body, a keyboard, a display device and a display panel. The display panel is formed of a flat type, which is made of an LCD or a PDP. The display device can be folded toward or folded away from the keyboard side of the main body. The speaker panel is completely formed as a planar shape and is movably installed with respect to a reception slit prepared at two side surfaces of the display device. The speaker panel is movably jointed to allow a relative position between the flat panel display and the speaker panel to be changed by moving the speaker panel.
摘要:
A piezoelectric transformer comprises one or more input parts having first internal electrodes and input terminals and an output part having second internal electrodes and output terminals. Each of the second internal electrodes has an area larger than that of each of the first internal electrodes. By such configuration, output power is increased while heat generation is suppressed and size thereof is not increased.
摘要:
The piezoelectric transformer obtains large output powers by way of reducing the heat generation. The piezoelectric transformer includes one or more input parts and an output part. Each of the input parts is formed of alternately stacked piezoelectric sheets and internal electrodes. Each piezoelectric sheet has a first region on which the internal electrode is formed and a second region on which no internal electrode is formed. Each of the input parts includes means for reducing stress concentration around boundary regions between the first and the second regions.
摘要:
A piezoelectric transformer includes an output part having laminated sheets formed of a first piezoelectric material and one or more input parts, each having laminated sheets made of a second piezoelectric material. The piezoelectric strain constant of the second piezoelectric material is greater than that of the first piezoelectric material.
摘要:
Provided is a vitreous silica crucible for pulling silicon single crystals, which can melt a silicon raw material in a short time and improve production yield of silicon single crystals by temporal change of an opaque vitreous silica layer. The vitreous silica crucible includes an opaque vitreous silica layer(11) provided on an outer surface thereof and containing plural bubbles, and a transparent vitreous silica layer(12) provided on an inner surface and not containing bubbles substantially. The opaque vitreous silica layer(11) has a bubble diameter distribution in which the content of bubbles having a diameter of less than 40 μm is 10% or more and less than 30%, the content of bubbles having a diameter of 40 μm or more and less than 90 μm is 40% or more and less than 80%, and the content of bubbles having a diameter equal to or more than 90 μm is 10% or more and less than 30%. Relatively small bubbles contained in the opaque vitreous silica layer(11) contribute to the thermal conductivity of a crucible at an initial pulling stage, and relatively large bubbles contained in the opaque vitreous silica layer are expanded through a long-term pulling process to thereby largely contribute to the warmth retaining property of the crucible at a later pulling stage.
摘要:
A coil-type electronic component has a coil inside or on the surface of its base material and is characterized in that: the base material is constituted by a group of grains of a soft magnetic alloy containing iron, silicon and other element that oxidizes more easily than iron; the surface of each soft magnetic alloy grain has an oxide layer formed on its surface as a result of oxidization of the grain; this oxide layer contains the other element that oxidizes more easily than iron by a quantity larger than that in the soft magnetic alloy grain; and grains are bonded with one another via this oxide layer.
摘要:
A coil-type electronic component has a coil inside or on the surface of its base material wherein the base material in the coil-type electronic component is constituted by a group of grains of a soft magnetic alloy containing iron, silicon and other element that oxidizes more easily than iron; the surface of each soft magnetic alloy grain has an oxide layer formed on its surface as a result of oxidization of the grain; this oxide layer contains the other element that oxidizes more easily than iron by a quantity larger than that in the soft magnetic alloy grain; and grains are bonded with one another via this oxide layer. The coil-type electronic component can be produced at low cost and combines high magnetic permeability with high saturation magnetic flux density.
摘要:
A silica glass crucible having a sidewall portion and a bottom portion is provided with a first synthetic silica glass layer constituting an inner layer at least in the sidewall portion, a second synthetic silica glass layer constituting an inner layer at least in a region including a center of the bottom portion, and a natural silica glass layer constituting an outer layer in the sidewall portion and the bottom portion. A melting rate of the second synthetic silica glass layer with respect to a silicon melt is higher than that of the first synthetic silica glass layer. An aluminum concentration of the second synthetic silica glass layer is higher than that of the first synthetic silica glass layer.
摘要:
A vitreous silica crucible manufacturing apparatus includes a plurality of carbon electrodes configured to heat and melt raw material powder by arc discharge, and a value of a ratio R2/R1 of a diameter R2 of a front end of each of the carbon electrodes to a diameter R1 of a base end is set in a range of 0.6 to 0.8. Each carbon electrode has a diameter reduction portion formed at a front end position and reduced in diameter from a diameter R3 of a base end side to the diameter R2 of the front end. When a length of the diameter reduction portion is L1, the diameter of the front end is R2, the diameter of the base end is R1, an angle between the axis lines of the carbon electrodes is θ1, and X=(R1−R2)/2, a value of L1−(X/tan(θ1/2)) is set in a range of 50 to 150 mm.
摘要:
The purpose of the present invention is to provide a crucible which has high viscosity at high temperature, and can be used for a long time, and can be manufactured at low cost, and a method of manufacturing the same. The composite crucible 10 is characterized in the use of mullite (3Al2O3.2SiO2) as the basic material of the crucible. The composite crucible 10 has the crucible body 11 made of mullite material whose main component is alumina and silica, and a transparent vitreous silica layer 12 formed on the inner surface of the crucible body 11. The thickness of the transparent vitreous silica layer 12 is smaller than that of the crucible body 11. The crucible body 11 can be formed by the slip casting method, and the transparent vitreous silica layer 12 can be formed by the thermal spraying method.