Abstract: The present invention is directed to provide a compact and light-weighted projection lens system that is capable of projecting an image at an angle as wide as 75 degrees with sufficient field angle and brightness as represented by F number of approximately 2.4, that is capable of effectively correcting chroic aberration of magnification and aberration of distortion and exhibiting optical stability against environmental variations, and that is suitable to obtaining an extraordinarily fine image by the magnification and projection.

Abstract: The invention is dedicated to a compact and lightweight high zoom ratio lens which is configured in 4 lens group zoom system with a deployment of positive, negative, positive, and positive refraction lens groups in order, being approximately 75 degree in shooting angle of view at a wide-angle end, approximately f/3 to 4 at the wide-angle end, and approximately f/6 to 7 at a telephoto end so as to implement an enhanced variable zoom power up to approximately 10. The zoom lens includes first to fourth lens groups each comprised of a plurality of lenses, the lens groups having respective refractive indices of positive, negative, positive, and positive levels in order from the closest to an object.

Abstract: A bracket/collar is disclosed to circumscribe an integrated circuit card into an electrical or an optical connector. The bracket/collar has several features, such as grooves, to hold the circuit card into the bracket; the grooves may be on any available edge not mating with or held by the connector, and may hold a corner or other feature of the circuit card. Another feature of the bracket/collar is a mechanism, such as a hook or notch, to connect with the connector. Yet another feature of the bracket/collar is that, by its shape, it provides sufficient loading of the circuit card into the connector so that when dropped or otherwise mechanically shocked, the circuit card is not displaced from its connector. The bracket/collar is especially useful to secure DIMM memory cards within their electrical connectors in handheld computers.

Abstract: A battery latch for a portable electronic device is made of a resilient material and includes integral spring members that make the use of a separate steel spring unnecessary. The battery latch is low-profile, allowing it to be easily integrated into a housing with limited space. The battery latch includes protruding members that are biased by the integral spring members into a recess that is designed to receive the battery pack. The protruding members include a beveled or curved surface that the battery pack presses against when the battery pack is being pressed into place. The force of the battery pack overcomes the bias of the integral spring members and forces the battery latch into the housing, thereby making room for the battery pack to slide past the protruding members of the battery latch. The battery pack includes recesses that align with the protruding members of the battery latch once the battery pack is fully seated in the housing.

Abstract: The present invention is directed to a compact and lightweight high magnification zoom lens utilizing a 4-element zoom layout of positive, negative, positive, and positive in refractive property, which is approximately 75 degrees in shooting angle of view at a wide-angle end, approximately F/3 to F/4 in F-number at the wide end, approximately F/5 to F/6 at a tele end, and approximately 6 to 7 in zoom ratio. The zoom lens includes first to fourth elements each comprised of a plurality of lenses, and the elements have respective refractive powers of positive, negative, positive, and positive levels in order from the closest to a subject. Only the second element of lenses is moved for focusing while the conditions described as follows are satisfied: 0.065<&phgr;T/|&phgr;2|<0.085  (1) 0.35<&phgr;T/|&phgr;1<0.55   (2) 0.25<&phgr;T/&phgr;4<0.35  (3) 0.75<|&bgr;2T|<0.

Abstract: A biaxial flux gate type magnetic sensor has a core which is made of a magnetic thin film in the shape of a loop, patterned upper and lower electrically conductive thin-film layers respectively above and below this core each with an insulating layer in between, and electrically conductive connecting members each extending between and electrically connecting these upper and lower electrically conductive layers. These upper and lower electrically conductive layers are patterned and the contact portions connect them such that they together provide an excitation coil and four detection coils. These coils are each formed so as to be wound helically and uniformly around and along a circumferential direction of the loop-shaped core by passing both inside and outside the loop. The loop is of a shape which is symmetrical with respect to two mutually perpendicular directions and is divided into four mutually symmetric sections.

Abstract: A ventilation fan for a PC has a plurality of blades disposed around a rotary hub. Each blade is shaped differently from the others to an extent that the air volume handling capacity of the blades is not substantially diminished. The noise level generated by a fan in a specific frequency range is caused by the change in air pressure and is attributable to the symmetry of the fan blade shapes. By altering the shape of the individual blades, the noise level due to pressure change is attenuated. Each blade slightly differs in shape from the others to eliminate air pressure changes. The noise level of the fan is suppressed within an allowable range even when the number of blades and the rotational speed of the fan are increased for better air flow. Preferably, the shape of each blade is varied from the others by putting an adhesive such as putty on the front surface and/or the back surface thereof near the hub.

Abstract: A cooling device has a heat sink for transferring a portion of heat generated by a heat generating component to a position different from the position of the heat generating component by heat conduction, a heat pipe for forcibly transferring at least a portion of the rest of the heat generated by the heat generating component to a position different from the position of the heat generating composition, and a forced-heat-radiating means for forcibly radiating the transferred heat from the heat radiating means.

Abstract: A multi-terminal surge protection device able to absorb surges of either polarity between lines and between a line and ground, in which the difference in operating time between the device elements connected to lines is reduced. A plurality of unipolar surge protection device elements are used which only operate to absorb surges of a specific polarity, and do not exhibit a reverse withstand characteristic upon application of a reverse-polarity voltage. One element is connected to a first line and another element to a second line, while a different element is connected to ground. A semiconductor substrate and second electrode are used that are common to all elements. To prevent lateral interference between elements, at least the element connected to ground is isolated from the line elements.

Abstract: An automatic charging apparatus comprises a rectifier circuit composed of a plurality of diodes and thyristors, said diodes and thyristors being arranged in a bridge connection, a phase control circuit for obtaining the charging voltage of a battery by controlling the phase of said thyristors, a voltage setting resistor for setting a charging voltage suitable for the state of said battery, a current setting resistor for setting a charging current suitable for the state of said battery and a current control circuit which obtains the charging current best suited to the state of the battery by controlling the pulse width of base current flowing in a transistor connected to the outputs of said thyristors. As a result, it is possible to efficiently charge the battery with charging voltage and current best suited to the state of the battery even if the battery is of large capacity.

Abstract: There is disclosed an energy regenerating mechanism of an automobile, particularly to that adapted for an electric car. The energy regenerating mechanism is characterized in that a plurality of generators are provided so that the kinetic energy generated when the engine idles and the automobile continues running is converted into electric energy.

Abstract: This invention relates to naphthol aralkyl resins of the general formula (I) ##STR1## in which A is a naphthalene nucleus, R is hydrogen or methyl, and n is an integer from 0 to 15 and cured products thereof, which are highly heat- and moisture-resistant, possess excellent impact strength and other mechanical properties, and are useful for such applications as lamination, molding, casting, and adhesion.

Abstract: A small-sized closed cycle type heat engine capable of efficiently recovering the working medium gas. The closed cycle type heat engine comprises a shaft having one end on which a first reduction gear is mounted, a second reduction gear meshing with the first reduction gear and connected to a generator, a compressor mounted on the other end of the shaft, front, middle and rear gas turbines sequentially coaxially mounted on the shaft, first to fourth heat exchangers for communicating with the front, middle and rear gas turbines so that the working medium gas in the front, middle and rear gas turbines is subjected to the thermal expansion and pressure expansion, thereby improving the recovery of the working medium gas.

Abstract: Polyimide copolymers of this invention have a repeating unit of the general formula (1) ##STR1## wherein Ar.sub.1 is a tetravalent organic radical containing at least one aromatic ring, R.sub.1 is a divalent organic radical, R.sub.2 and R.sub.3 are monovalent hydrocarbon radicals, and n is an integer from 0 to 4 and a repeating unit of the general formula (2) ##STR2## wherein Ar.sub.2 is a tetravalent organic radical containing at least one aromatic ring, R.sub.6 is a divalent organic radical, R.sub.7 is a monovalent hydrocarbon radical with 1 to 6 carbon atoms, and l is an integer from 5 to 50 and are capable of forming films of a microdomain structure useful for such applications as protective films on semiconductors, coatings adhesives, moldings, films, and separation membranes.

Abstract: The invention relates to naphthol-based epoxy resins of the general formula (I) ##STR1## in which A is a naphthalene nucleus, R is hydrogen or methyl, and n is an integer from 0 to 15, naphthol aralkyl resins which are intermediates for said epoxy resins, a process for the preparation of said naphthol aralkyl resins, and epoxy resin compositions containing said naphthol-based epoxy resins which are highly heat- and moisture-resistant, possess excellent impact strength and other mechanical properties, and are useful for such applications as lamination, molding, casting, and adhesion.

Abstract: The present invention discloses a same polarity induction generator comprising a casing, a stator composed of a plurality of magnetic poles spaced away at a predetermined mechanical angle, a rotary shaft, a rotor mounted on said rotary shaft and composed of two pairs of ferrite magnets each pair having one polarity located outwardly of a circumference of the rotor and the other polarity located inwardly of the circumference, the respective pairs being arranged so as to have different polarities on the outer circumference of the rotor, magnetic cores fixedly mounted on the casing, and coil wirings each wound around said respective magnetic cores so as to intersect magnetic fluxes formed among said ferrite magnets.

Abstract: Polyimide-based separation membranes of this invention are made from polyimides having repeating units of the general formulas (A) and (B) ##STR1## wherein Ar.sub.1 and Ar.sub.3 are tetravalent aromatic radicals containing at least one aromatic ring, Ar.sub.2 is a divalent aromatic radical containing at least one aromatic ring, R.sub.1 and R.sub.2 are organic radicals, R.sub.3 to R.sub.6 are monovalent hydrocarbon radicals, and n is an integer from 1 to 50 at a mole ratio (A)/(B) of 5/95 to 95/5, have high gas permeation coefficients, high mechanical strength, and excellent heat resistance, and are useful for separation and concentration of mixed gases.

Abstract: Silicon-modified polyimides of this invention containing a basic structure of the general formula (1) ##STR1## in which R and R' are hydrogen or alkyl, B is the amineless residue of a diamine, and X is divalent radical ##STR2## in which R.sub.1 to R.sub.4 are monovalent hydrocarbon groups with 1 to 6 carbon atoms show excellent heat resistance and solubility in various solvents and are useful for films for orientation of LCD's, junction coating resins for diodes, passivation films for IC's and LSI's, and alpha ray shielding films for VLSI's.

Abstract: A heat-sensitive recording material contains, in its heat-sensitive, color-developing layer comprising a leuco dye and an organic acid that reacts with said leuco dye to develop color upon heating, a hydrocarbon compound melting at a temperature in the range from 50.degree. C. to 200.degree. C. and selected from benzylbiphenyls, alkyl-substituted benzylbiphenyls, hydrogenated benzylbiphenyls, hydrogenated alkyl-substituted benzylbiphenyls, hydrogenated terphenyls and hydrogenated alkyl-substituted terphenyls. With its quick thermal response, this material is suitable for high-speed recording.

Abstract: Solid catalyst components produced by reacting an organomagnesium compound with an alkoxy compound of the formula,R.sup.1.sub.a Al(OR.sup.2).sub.b X.sub.cwherein R.sup.1 and R.sup.2 are each a hydrocarbon group having 1 to 20 carbon atoms, X is a halogen atom and a, b and c are numbers satisfying the equations at the same time,0.ltoreq.a<3, 0<b.ltoreq.3, 0.ltoreq.c<3, and a+b+c=3and/or of the formula,R.sup.3.sub.d P(OR.sup.4).sub.e X.sub.fwherein R.sup.3 and R.sup.4 are each a hydrocarbon group having 1 to 20 carbon atoms, X is a halogen atom, and d, e and f are numbers satisfying the equations at the same time, 0.ltoreq.d<3, 0<e.ltoreq.3, 0.ltoreq.f<3, and d+e+f=3 to produce a solid product, and allowing the solid product to support a titanium compound and/or a vanadium compound, and a method for producing polyolefins which comprises polymerizing olefin in the presence of a catalyst system comprising said solid catalyst component and an organoaluminum compound.