Abstract: In a color wheel comprising a plurality of color filter segments arranged so as to form a disk and a support member fixed to the color filter segments, the color filter segments are each outlined only by a circular arc and two straight lines passing through the center of the disk. Consequently, each of the color filter segments is prepared by cutting the material only to the circular arc and the two straight lines, thereby simplifying the production process. And, the support member can be duly and surely positioned such that the center of the support member is set to coincide with the intersecting point of the two straight lines. Thus, the positional accuracy, the component cost reduction, and the production cost reduction can be achieved at the same time.

Abstract: A color wheel is attached to a hub of a motor before the hub is built in the motor. In this process, portions of the hub which do not impact the rotation accuracy of the motor are held by appropriate clamping means and attaching means so that excessive stress and heat are not applied to bearings of the motor. Then, the hub with the color wheel attached thereto is assembled to the rest of components of the motor.

Abstract: A color wheel assembly includes a color wheel and a driving motor. The color wheel is attached directly to a hub of the driving motor. Consequently, no additional components are required to fix the color wheel to the driving motor, thereby reducing the number of components and the number of manufacturing processes. Thus, the color wheel assembly as a time-share light dispersing device can be inexpensively manufactured with a high degree of precision.

Abstract: A color wheel assembly includes a color wheel and a driving motor. The color wheel is attached directly to a hub of the driving motor. Consequently, no additional components are required to fix the color wheel to the driving motor, thereby reducing the number of components and the number of manufacturing processes. Thus, the color wheel assembly as a time-share light dispersing device can be inexpensively manufactured with a high degree of precision.

Abstract: A color wheel comprises sectorial color filter segments and a support member. Protrusions are disposed at the support member and engaged with either through-holes or cavities as segment fixing mechanisms formed at the color filter segments, whereby the color filter segments are fixedly positioned with respect to the support member in the radial direction. Consequently, the color filter segments can be surely prevented from getting scattered off when the color wheel spins at high speed.

Abstract: In a color wheel comprising plurality of color filter segments, one of the filter segments consists of a sector portion, and a circular core portion which is formed intergrally at the inner circumferential area of the sector portion, and which is located at the center of the wheel assembled. The inner circumferences of the remaining filter segments are fitted directly to the outer perimeter of the circular core portion of the one segment, whereby the geometric accuracy of the color wheel can be achieved. Also, the alignment process of the filter segments for preventing the color wheel from generating vibrations and noises at the time of spinning at high speed can be simplified or even eliminated thus preventing the number of manufacturing processes from increasing.

Abstract: A color wheel includes lens structures, which are formed on a surface of a substrate opposite to a surface having filter sectors, and which have curved surfaces formed at their abutting ends and positioned along a boundary between adjacent filter sectors. Light impinging on an area of the substrate corresponding to the boundary is deflected due to one of the curved surfaces so as to be surely guided into one of the adjacent filter sectors and to be duly dispersed into a predetermined color, whereby light can be efficiently utilized.

Abstract: A color wheel is fabricated with filter sectors formed on both surfaces of a substrate such that filter sectors adjacent to each other are disposed respectively on the top and bottom side surfaces of the substrate, whereby structures as means for demarcating each of the filter sectors can be shaped on the substrate at one time so that the adjacent filter sectors can be positioned with respect to each other with an accuracy of the demarcation of the structures without positioning masking jigs every time each filter is formed.

Abstract: A color wheel includes lens structures, which are formed on a surface of a substrate opposite to a surface having filter sectors, and which have curved surfaces formed at their abutting ends and positioned along a boundary between adjacent filter sectors. Light impinging on an area of the substrate corresponding to the boundary is deflected due to one of the curved surfaces so as to be surely guided into one of the adjacent filter sectors and to be duly dispersed into a predetermined color, whereby light can be efficiently utilized.

Abstract: A color wheel is fabricated with filter sectors formed on both surfaces of a substrate such that filter sectors adjacent to each other are disposed respectively on the top and bottom side surfaces of the substrate, whereby structures as means for demarcating each of the filter sectors can be shaped on the substrate at one time so that the adjacent filter sectors can be positioned with respect to each other with an accuracy of the demarcation of the structures without positioning masking jigs every time each filter is formed.

Abstract: A clear image can be achieved by preventing dusts from collecting in grooves formed in a transparent substrate and by improving contrast as well. A film is provided in such a manner as to cover a light reflection pattern formed in the surface of the transparent substrate. The film is sealingly fixed to the transparent substrate for preventing dusts from entering the light reflection pattern (particularly the grooves) during the process of assembling the spread illuminating apparatus. Also, the surface of the transparent substrate can be protected from scratches thanks to the film fixed. The amount of interface reflection can be reduced by using resin or the like as the film material, and contrast can be improved by setting the thickness of the film to a value smaller than prescribed.

Abstract: A clear image can be achieved by preventing dusts from collecting in grooves formed in a transparent substrate and by improving contrast as well. A film is provided in such a manner as to cover a light reflection pattern formed in the surface of the transparent substrate. The film is sealingly fixed to the transparent substrate for preventing dusts from entering the light reflection pattern (particularly the grooves) during the process of assembling the spread illuminating apparatus. Also, the surface of the transparent substrate can be protected from scratches thanks to the film fixed. The amount of interface reflection can be reduced by using resin or the like as the film material, and contrast can be improved by setting the thickness of the film to a value smaller than prescribed.

Abstract: A spindle motor comprises a rotor, which is rotatably supported by a stator, a rotor yoke, which is made up of a magnet fixed onto the rotor and a drive magnet, which is made of a bonded magnet which is adhesively fixed onto the rotor. A first metallic layer is formed onto a surface on the rotor yoke facing the drive magnet. A second metallic layer is formed on a surface of the drive magnet facing the rotor yoke.

Abstract: A solid electrolyte capacitor comprises a capacitor element disposed in a case, and a rubber seal member tightly fitted in an upper opening of the case, with lead terminals projecting from the element and extending through the seal member. To fabricate the capacitor, a TCNQ complex salt is placed into a heating box and melted by heating. The capacitor element is placed into the box, impregnated with the complex salt, then immediately withdrawn from the box and cooled in air to solidify the salt by cooling. Subsequently, the lead terminals of the element are inserted through the seal member. The element is placed into the case which has approximately the same diameter as the heating box, with the seal member attached to the element, and the case is constricted to seal off its opening, whereby the solid electrolyte capacitor is obtained.

Abstract: Disclosed herein is a solid electrolyte capacitor with organic semiconductor which comprises a capacitor element, a solid electrolyte layer formed by heating and melting TCNQ complex salt, impregnating the TCNQ salt into the capacitor element and thereafter cooling and solidifying the same, a powder coating layer formed to cover an upper portion of the capacitor element through a clearance, and a sealing resin layer covering the powder coating layer for sealing the capacitor element.Since the powder coating layer is formed on the upper portion of the capacitor element through a clearance, it is possible to reduce influence exerted on the element by contraction or expansion caused by thermal stress which is applied in a soldering step. Consequently, it is possible to suppress increase of a leakage current.

Abstract: In a solid electrolyte capacitor, an improvement wherein the solid electrolyte is a mixture of at least two kinds of 7,7,8,8-tetracyanoquinodimethane complexes having cations different from each other which is obtained by cooling the mixture in a liquid state, the mixture being so stable to a high heat applied to the capacitor upon mounting the same on a circuit board using reflow solder. Further, a method for aging solid electrolyte capacitors is also disclosed wherein a higher aging temperature is employed.

Abstract: A frequency generator includes a circuit board having one surface on which a generating coil pattern and a wiring pattern are printed in stacked relationship via an insulating layer. In a preferred embodiment, the coil is pointed over the wiring pattern.

Abstract: An electrolyte for electrolytic capacitors comprising N-ethylformamide or its mixture with any other solvent containing at least about 10% by weight of N-ethylformamide and an acid salt of maleic acid with ammonia or an amine. The electrolyte can be used in electrolytic capacitors designed to operate in a temperature range of about -65.degree. to 100.degree. C.