Abstract: A chip antenna in which correct evaluation and inspection of a conductor can be performed regardless of the state of grounding. The chip antenna has a rectangular-prism-shaped substrate formed of a dielectric material comprising, e.g., barium oxide, aluminum oxide and silica. A copper or copper-alloy conductor is spirally wound within the substrate in the longitudinal direction. A feeding terminal for applying a voltage to the conductor and a free terminal are disposed on the surfaces of the conductor. One end of the conductor is attached to the feeding terminal, while the other end is connected to the free terminal.

Abstract: An antenna device having a power supplying portion 52 mounted on a main wiring substrate 53a and a radiating portion 56a provided in a space between the main wiring substrate 53a and the inner surface of a sheathing case 55, the lower surface of the radiating portion 56a being opposed to the power supplying portion 52.

Abstract: In a color image forming apparatus, a plurality of image forming units 3Y, 3M, 3C and 3K, which correspond to a plurality of colors and with each unit including a developing device and a photosensitive drum, are retained so as to define a cylinder.

Abstract: A compact non-directional chip antenna. The chip antenna includes a rectangular-parallelopiped base made of printed circuit boards (specific inductive capacity: about 2 to 6) having a glass epoxy resin or glass fluororesin as main constituents, a conductor, made of copper or a copper alloy, which is wound in the shape of a spiral inside the base along the direction of the length of the base, and a power feeding terminal, for applying a voltage to the conductor, on the surface of the base. One end of the conductor forms a power feeding section and is connected to the power feeding terminal. The other end of the conductor forms a free end inside the base.

Abstract: An antenna apparatus which exhibits excellent mechanical strength and which is protected from heat and moisture, and also which is mountable on a printed wiring board with the provision of a clearance between the apparatus and the board, free from deformation caused by a warp of the board. The antenna apparatus has a rectangular-prism shaped substrate. A feeding terminal and a fixing terminal are disposed at the respective end surfaces in the longitudinal direction of the substrate. Metal strips serving as support terminals are soldered at the respective first ends to the feeding terminal and the fixing terminal, respectively. A coating material formed of a non-metallic material, such as glass, resin or the like, is applied to the surface of the substrate by way of coating, dipping or other method. A coating layer is thus formed on the substrate in a state in which the respective second ends of the metal strips project from the substrate.

Abstract: A miniature chip antenna suitable for use in low-frequency-band mobile communications is disclosed. The chip antenna has a rectangular-prism-shaped base member provided with a mounting surface. Disposed within the base member is a conductor spirally wound along the height of the base member. The base member is formed from e.g., ferrite comprising Ni--Zn having a relative magnetic permeability of 7. The conductor is made from a metal comprising, e.g., Cu, Ni, Ag, Pd, Pt, or Au, and is formed by printing, depositing, laminating or plating. The base member and the conductor are then integrally sintered. A conductor having a rectangular cross section and spirally wound along the height of the base member is thus formed within the base member.

Abstract: A helical antenna is provided in which a predetermined resonance frequency can be determined at the design stage. The helical antenna includes a conductor which is formed from copper or a copper alloy inside a base in the shape of a rectangular parallelopiped formed from a dielectric material having barium oxide, aluminum oxide and silica as main constituents and which is wound in a helical shape along the length of the base. In such a case, the resonance frequency f0 of the helical antenna and the inductance components L of the conductor satisfy the relationship: ln (L)=A0+A1.times.ln (f0), where ln is a natural logarithm, and A0 and A1 are constants. One end of the conductor is extended onto the surface of the base and forms a power feeding terminal connected to a power feeding terminal formed on the surface of the base for applying a voltage to the conductor, and the other end thereof forms a free end inside the base.

Abstract: An antenna device is provided in which deterioration of characteristics is prevented and which has improved strength. A chip antenna is inserted into a resin case serving as a support member, and one terminal of the resin case is bonded to a power feeding terminal and another terminal of the case is bonded to a fixation terminal of the chip antenna 2 by solder. The chip antenna is fixed to the resin case so that a gap is provided between the printed circuit board on which the chip antenna is mounted and the chip antenna. Then, by bonding the terminals of the resin case to the printed circuit board by solder, the chip antenna is mounted on the printed circuit board.

Abstract: A surface mount antenna having increased mechanical strength, and whose properties do not deteriorate when exposed to heat and moisture. The surface mount antenna includes a substrate, and a conductive portion in or on the substrate, with an electrical supply terminal formed on a surface of the substrate in order to apply voltage to the conductive portion. A covering material is provided to cover the substrate by coating, dipping, or the like.

Abstract: A meander line antenna includes a rectangular-parallelopiped base member made from a dielectric material having barium oxide, aluminum oxide, and silica as main components, a meander-shaped conductor having, e.g., 10 corners made of copper or a copper alloy by printing, deposition, pasting, or plating inside the base member, and a power-feed terminal for applying a voltage to the conductor. The meander-shaped conductor is formed in the longitudinal direction of the base member. One end of the conductor is led to a surface of the base member to form a power-feed section and is connected to the power-feed terminal. The other end of the conductor serves as an open end inside the base member.

Abstract: A chip antenna in which desired antenna characteristics can be obtained without restricting the type of at least one of a dielectric material and a magnetic material used for a base member of the antenna, as well as the type of metal material used for a conductor, or without limiting the sintering conditions of the above-described materials. The chip antenna includes a rectangular-prism-shaped base member having a mounting surface. A conductor, e.g. silver, is spirally wound inside the base member. A feeding terminal is formed over surfaces of the base member so as to feed power to the conductor. One end of the conductor is extended to a surface of the base member to form a feeding section, which is connected to the feeding terminal. The other end of the conductor serves as a free end within the base member. The base member is produced by laminating mixture layers made from a mixture of glass essentially consisting of borosilicate having a softening point of approximately 700.degree. C.

Abstract: A chip antenna comprising a substrate comprising at least one material selected from dielectric materials and magnetic materials, at least two conductors formed on at least one surface of the substrate or inside the substrate, and at least one feeding terminal provided on the surface of the substrate for applying a voltage to the conductors.

Abstract: A miniature chip antenna which can be utilized as an antenna for use in a high-frequency region is provided. The chip antenna comprises a substrate, at least one conductor, and at least one feeding terminal. The substrate comprises a dielectric material portion and a magnetic material portion, at least a part of the magnetic material portion being exposed to the exterior of the substrate. The conductor is formed at least either on the surface of the substrate or inside the substrate. The feeding terminal is provided on the surface of the substrate to impress a voltage on the conductor.

Abstract: A downsized chip antenna having a large bandwidth ratio is disclosed. The chip antenna has a rectangular prism-shaped base member providing a mounting surface. A conductor is formed inside the base member in such a manner that it is spirally wound around a winding axis, for example, a winding axis parallel to the mounting surface, i.e., in the longitudinal direction of the base member. One end of the conductor is extended to a surface of the base member to form a feeding section, which is connected to a feeding terminal, disposed over the surfaces of the base member to apply voltage to the conductor. In one embodiment, the other end of the conductor is connected to a midway portion of the conductor within the base member, thereby forming a loop in said conductor.

Abstract: A surface mounting type antenna system 10 is formed by spirally winding a conductor 14 made of copper or copper alloy, with a power supply member 12 provided at one end of the conductor 14, the other end thereof being a free end 13, on the edge faces of a rectangular parallelepiped as a dielectric substrate 11 by printing, deposition, pasting or plating. The dielectric substrate 11 is prepared by stacking a plurality of layers of ceramics, resin or a combination of ceramics and resin. On the underside 111 of the dielectric substrate 11 lies a power supply terminal 15 to which the power supply member 12 of the conductor 14 is connected. The power supply terminal 15 is simultaneously used as a fixing terminal for securing the surface mounting type antenna system 10 to, for example, a mounting board. Moreover, the conductor 14 squarely intersecting the axis C of the conductor winding is rectangular in transverse cross section having a width of w and a length of l.

Abstract: A color image forming apparatus having a simple mechanism for switching plural photosensitive drum units and still maintaining a high resolution image is provided. In the apparatus, each image forming unit including each color photosensitive drum is disposed around a rotating shaft of a carriage. Each photosensitive drum has a coupling plate at one end, which is engaged by a drive side coupling plate for transmitting a drive force to the photosensitive drum, when the image forming units is moved to the image forming position. An output shaft that rotates the drive side coupling plate supports an edge of a photosensitive drum shaft in alignment. A toner image formed on the photosensitive drum is transferred onto a transfer belt, which rotates at a constant speed, one by one to form a multicolor image on the transfer belt. The multicolor image on the transfer belt is transferred onto a paper sheet. A transmission between a motor and the carriage include a worm gear.

Abstract: A chip antenna having a substrate comprising either of a dielectric material or a magnetic material, at least one conductor formed on at least one side of a surface of the substrate or inside the substrate, and at least one feeding terminal provided on the surface of the substrate for applying a voltage to the conductor, a part of the conductor connecting with the feeding terminal. The end section of the conductor or a portion of the conductor other than an end section of the conductor may be connected with the feeding terminal.

Abstract: A small radio communication unit which requires no antenna adjustment is provided by using small chip antennas whose gain is not degraded and which have a wide bandwidth.

Abstract: An antenna apparatus having a predetermined impedance is provided. The apparatus has a chip antenna including a conductor and a mounting board on which the antenna is mounted. A ground pattern and a microstrip line are formed on the board. A feeding terminal for applying a voltage to the conductor is deposited on the surface of the antenna. Solder may be used to connect the feeding terminal of the antenna to the microstrip line formed on the board. A capacitance generating device, e.g., a dielectric resin or capacitor is disposed between the microstrip line connected to the feeding terminal of the antenna and the ground pattern. A capacitance is thus generated between the microstrip line and the ground pattern thereby enabling regulation of the antenna apparatus impedance and bandwidth.

Abstract: A chip antenna which provides a high gain and large band width and which makes it possible to achieve a reduction in the size of the chip antenna. The chip antenna has a dielectric base which is formed as a rectangular parallelepiped containing a spirally wound conductor whose winding axis is perpendicular to the longitudinal dimension of the dielectric base and parallel to the mounting surface. The configuration of the winding cross section S, which is perpendicular to the winding axis of the conductor, is a rectangle whose longitudinal vertical dimension is H and whose horizontal dimension is W. One end of the conductor is led out to the surface of the dielectric base to form a feeding end that is connected to a feeding terminal for applying a signal to the conductor, and the other end thereof forms a free end within the dielectric base.