Abstract: Even if a recording medium is interfered with an opposed surface of a carriage and/or a recording head due to the curl of the recording medium, damage of the recording medium and the recording head is prevented by avoiding collision between an edge of the recording medium and the carriage and/or the recording head. The opposed surface (opposed to the recording medium) of the recording head 1 or the carriage is made smooth to form a smooth portion, and a moving range of the carriage is limited so that the smooth portion is not moved out of the recording medium, and a preliminary discharge receiving portion for receiving ink discharged to recover the recording head is disposed within the moving range of the carriage, and the moving range of the carriage is controlled to be limited when it is judged that curl will occur in the recording medium.

Abstract: An induction heating roller apparatus has a heating roller for generating heat with an induction current by being magnetically coupled to an induction coil, and a plurality of induction coils placed in a dispersed state in an axial direction inside the heating roller and also set such that adjacent heating rollers are in mutually reversed winding directions so that generated flux has the same polarity. A high frequency power supply is provided for supplying high frequency power to the plurality of induction coils.

Abstract: An induction heating roller device that keeps leakage current within specifications and prevents the occurrence of erroneous operations caused by common mode noise. The induction heating roller device includes an induction coil, a grounded heating roller magnetically coupled to the induction coil and heated by electro-magnetic induction. A power factor improving capacitor is connected in parallel to and near the induction coil and has a grounded intermediate point. A high-frequency power source biases the induction coil. The leakage current produced by distributed capacitance between the induction coil and the heating roller is returned to the high-frequency power source via the power factor improving capacitor. Thus, the leakage current does not flow out of the induction heating roller device.

Abstract: An induction heating roller apparatus has a heating roller capable of switching among a plurality of heating areas of different lengths according to a size of an object to be heated, a plurality of first induction coils opposed to a plurality of heating areas of the heating roller, and second induction coils placed opposite a part astride adjacent heating areas of the heating roller. A high frequency power supply provides high frequency power to the first and second induction coils. High frequency output is selectively supplied to the first induction coils and the second induction coils.

Abstract: To provide an induction heating roller unit that can efficiently supply power to a heating roller, and fixing device and image forming apparatus incorporating the same. The induction heating roller unit includes: a heating roller; and an induction coil having an outer diameter more than 0.7 times that of the heating roller, the heating roller being concentrically disposed outside said induction coil and generating heat by the effect of an induced current caused by a magnetic field produced by the induction coil. Since the ratio of the outer diameter of the induction coil to that of the heating roller is 0.7 or higher, power can be transferred from the induction coil to the heating roller with an extremely high efficiency.

Abstract: An induction heating roller device that keeps leakage current within specifications and prevents the occurrence of erroneous operations caused by common mode noise. The induction heating roller device includes an induction coil, a grounded heating roller magnetically coupled to the induction coil and heated by electro-magnetic induction. A power factor improving capacitor is connected in parallel to and near the induction coil and has a grounded intermediate point. A high-frequency power source biases the induction coil. The leakage current produced by distributed capacitance between the induction coil and the heating roller is returned to the high-frequency power source via the power factor improving capacitor. Thus, the leakage current does not flow out of the induction heating roller device.

Abstract: An induction heating roller device that reduces noise emission to the outside and facilitates insulating between induction coils and nearby metal materials. The induction heating roller device includes a heating roller, a plurality of induction coils arranged in the axial direction of the heating roller, and a high-frequency power source for supplying high-frequency power to the plurality of induction coils. The high-frequency power source has a first output terminal set at a stable potential, and a second output terminal set at a non-stable potential. A pair of induction coils are arranged at the ends of the heating roller and a first end of the coils is positioned at the end of the heating roller and a second end of the coils is positioned in the central side of the heating roller. The first end of each of the two induction coils is connected to the first output terminal, and the second end of each of the two induction coils is connected to the second output terminal.

Abstract: An induction heating roller apparatus has a heating roller HR capable of switching among a plurality of heating areas of different lengths according to a size of an object to be heated, a plurality of first induction coils IC1, IC3 placed to be opposed to a plurality of heating areas of the heating roller HR, second induction coils IC2 placed opposite a part astride adjacent heating areas of the heating roller HR, a high frequency power supply HFS for supplying high frequency power to the first and second induction coils IC1, IC3 and IC2, and induction coil selection means F1, F2 and F3 for selectively supplying high frequency output to the first induction coils IC1, IC3 opposed to the heating areas of the heating roller according to the size of the object to be heated and the second induction coils IC2 placed astride the heating areas of the heating roller HR.

Abstract: To provide an induction heating roller unit that can efficiently supply power to a heating roller, and fixing device and image forming apparatus incorporating the same. The induction heating roller unit includes: a heating roller; and an induction coil having an outer diameter more than 0.7 times that of the heating roller, the heating roller being concentrically disposed outside said induction coil and generating heat by the effect of an induced current caused by a magnetic field produced by the induction coil. Since the ratio of the outer diameter of the induction coil to that of the heating roller is 0.7 or higher, power can be transferred from the induction coil to the heating roller with an extremely high efficiency.

Abstract: To provide an induction heating roller apparatus and an image formation apparatus capable of evenly heating a heating roller in an axial direction, easily performing insulation among a plurality of induction coils placed in a dispersed state and rendering a heating area of the heating roller switchable if desired.

Abstract: Even if a recording medium is interfered with an opposed surface of a carriage and/or a recording head due to the curl of the recording medium, damage of the recording medium and the recording head is prevented by avoiding collision between an edge of the recording medium and the carriage and/or the recording head. The opposed surface (opposed to the recording medium) of the recording head 1 or the carriage is made smooth to form a smooth portion, and a moving range of the carriage is limited so that the smooth portion is not moved out of the recording medium, and a preliminary discharge receiving portion for receiving ink discharged to recover the recording head is disposed within the moving range of the carriage, and the moving range of the carriage is controlled to be limited when it is judged that curl will occur in the recording medium.

Abstract: An apparatus for measuring the flow rate of an intake air flowing through an air passage which communicates with an internal combustion engine is disclosed. The apparatus includes a heat-generating resistor element disposed in the air passage for detecting the flow rate of the intake air in the air passage, and at least one protective member disposed on upstream and/or downstream side(s) of the heat-generating resistor element as viewed in an air flow direction in which the intake air flows through the air passage, so as to extend in a direction perpendicular to the air flow direction. The protective member(s) is/are formed of a water-absorptive porous material, and have a plurality of holes formed through the thickness thereof in the air flow direction.

Abstract: An oxygen sensor having an excellent durability against poisoning by Si is provided by adhering at least one oxide of Mg, Ca, Sr or Ba on the surface or in the pores of the protective layer covering the measuring electrode of the oxygen sensor.

Abstract: A resistor element including a cylindrical ceramic support having two openings open on longitudinally opposite end faces thereof, an electrically resistive layer formed on an outer circumferential surface, a pair of electrical conductors for connecting the electrically resistive layer to an external circuit, each of which has an end portion inserted into a corresponding one of the openings of the ceramic support, and an electrically conductive adhesive filling each opening of the ceramic support, for securing the end portion of the corresponding conductor to the ceramic support. The electrically resistive layer has two integrally formed extensions for covering the opposite end faces of the ceramic support, respectively, and respective inner wall surfaces of the openings of the ceramic support. The conductors are electrically connected to the extensions of the resistive layer by the electrically conductive adhesive filling each opening of the ceramic support.

Abstract: A resistor element for determining a parameter, including a planar ceramic substrate having a bearing surface and at least one aperture formed through the thickness thereof, an electrically resistive metallic layer which is substantially formed on the bearing surface of the ceramic substrate and has at least one extension which covers an inner wall surface of the above-indicated at least one aperture, a pair of conductors for connecting the resistive metallic layer to an external circuit, at least one of the pair of conductors being inserted into a corresponding one of the above-indicated at least one aperture of the ceramic substrate, and an electrically conductive adhesive at least partially filling each of the above-indicated at least one aperture, for securing an end portion of the corresponding one of the pair of conductors to the ceramic substrate, the electrically conductive adhesive electrically connecting the above-indicated at least one conductor to the above-indicated at least one extension of the

Abstract: A ceramic precombustion chamber construction of an internal combustion engine includes at least one ceramic body having a circular cross-section, a metal ring in which the ceramic body is fixed by shrinkage fitting, and at least one key interposed between the ceramic body and the metal ring for preventing rotation therebetween. Contour lines of a key receiving notch formed in an inner circumference of the metal ring are positioned on inner sides of contour lines of a key receiving notch formed in an outer circumference of the ceramic body. With the arrangement, the ceramic body is prevented from loosening from the fitting with the metal ring due to heat and vibration in use and is prevented from being damaged resulting from cracks occurring in the ceramic body.

Abstract: A piston for internal combustion engines is disclosed, which includes a piston main body of metallic material, and a ceramic piston head member embedded in the top portion of the piston main body. The piston head member is formed on its peripheral surface with one or more extensions of dovetail section protruding radially outwards and having an axially measured thickness which increases toward the outer end thereof. The piston head member is retained in place with a substantially constant retaining force, even during the operation of the engine.

Abstract: A metal-ceramic composite body comprises a metallic member and a ceramic member fitted thereinto. The metallic member has an effective strain A represented by the equation: A=(T.sub.a -T.sub.r).times..DELTA..sub.a +.DELTA..sub.d.

Abstract: A structure defining a divided combustion chamber of an internal combustion engine, including an upper ceramic member and a lower ceramic member having a passage which abut on each other at an interface to form therein the divided combustion chamber such that the chamber communicates with a main combustion chamber through a passage formed in the lower ceramic member. The upper and lower ceramics members have cutouts formed respectively in their outer surfaces so as to cooperate to constitute at least one external recess which extends across the interface. An expansion member is fitted in each external recess, and has a larger coefficient of thermal expansion than the upper and lower ceramic members, whereby the expansion member keeps the upper and lower ceramic members spaced apart from each other by a predetermined amount at their interface while the engine is operated.

Abstract: A precombustion chamber construction of an internal combustion engine includes an upper ceramic body and a lower ceramic body abutting thereagainst to form a precombustion chamber communicating through an injection hole with a main combustion chamber. According to the invention at least a portion of abutting surfaces of the upper and lower ceramic bodies is inclined relative to a plane perpendicular to a longitudinal axis of the precombustion chamber, thereby preventing any relative rotative movement of the upper and lower ceramic bodies even if they are subjected to rotating forces caused by vibrations of the engine or explosion of fuel.