Abstract: A chip antenna includes a first electrical conductor having a first end, a second electrical conductor extending in parallel with the first electrical conductor and having a second end located in alignment with the first end, a third electrical conductor extending between the first and second ends perpendicularly to the first and second electrical conductors, and a dielectric substrate. The first to third electrical conductors are integrally formed anywhere in the dielectric substrate, and power is fed to one of the first and second electrical conductors.

Abstract: An antenna element is formed with an extended portion, bent in a U-shape, in at least one of a first conductor and a second conductor of a conductive path. This structure permits the conductive path to be extended without increasing the size of the overall shape, so that the overall shape of the antenna element can be made compact without relatively extending the conductive path.

Abstract: An antenna element has parallel first conductor and second conductor connected by a short-circuit conductor to form a loaded inductance. A ground conductor is also formed on an outer surface of a device substrate which is formed with a conductive line comprised of the first conductor, second conductor and short-circuit conductor. The ground conductor has a terminate end connected to the conductive line, and is applied with a ground potential at a leading end. Since the ground conductor functions in a manner similar to a conventional short pin, the antenna element can provide a radiation resistance twice as much.

Abstract: A high pressure discharge lamp includes a quartz glass bulb having a sealing portion; and a pair of electrodes. Each electrode of the pair of electrodes is disposed so as to be opposite the other in the quartz glass bulb. The quartz glass bulb of the high pressure discharge lamp contains at least mercury and a halogen gas. The partial pressure of oxygen (O) in the quartz glass bulb is about 2.5×10−3 Pa or less and the partial pressure of the halogen gas in the quartz glass bulb is in the range between about 1×10−8 &mgr;mol/mm3 and 1×10−7 &mgr;mol/mm3.

Abstract: A collector of a traveling wave tube in which a larger quantity of loss ceramic members are arranged between an outer collector enclosure and an outer surface of a collector electrode for increasing high frequency loss to prevent RF leakage from the collector lead wire. The collector includes a collector electrode 2, heat conductive columnar ceramic elements 3, an outer collector enclosure 4 for maintaining vacuum and loss ceramic members 5 arranged between the outer surface of the collector electrode 2 and the inner surface of the outer collector enclosure 4.

Abstract: A high pressure discharge lamp includes a quartz glass bulb having an expanded portion and sealing portions, conductive elements, and a pair of electrodes. The conductive elements are sealed at the sealing portions of the quartz glass bulb. Each electrode is disposed so as to be opposite the other and connected to one conductive element. The lamp is characterized in that Dp (the distance between an end of each electrode) is in the range between 1.0 and 1.6 mm, S (the longest length of the expanded portion in the direction of a discharge path)=e×Di (wherein 0.8<e<1.0), Di (the largest inside diameter of the expanded portion transverse to the discharge path)=g×Dp (wherein 4<g<8 ), and Do (the largest outside diameter of the expanded portion transverse to the discharge path)<Di+4 mm.

Abstract: An electron gun also has a cathode for emitting electrons, a heater cap which contains a heater for applying the cathode with thermal energy for emitting electrons, a retainer for securing the cathode on the heater cap by clamping the peripheral edge of the cathode onto the heater cap, and a cylindrical Wehnelt supporter. The cylindrical Wehnelt supporter has a Wehnelt electrode for focusing an electron beam that is formed in such a shape that an average angle of the surface thereof with respect to an outermost shell of the electron beam matches a Pierce angle, and three or more heater cap supporters for securely supporting the heater cap at a position at which an electron emitting surface of the cathode and an opening formed through the wehnelt electrode satisfy a predetermined perveance.

Abstract: A high pressure discharge lamp includes a quartz glass bulb and a pair of electrodes. Each electrode of the pair of electrodes is disposed so as to be opposite the other in the quartz glass bulb. The quartz glass bulb of the high pressure discharge lamp contains at least mercury and a halogen gas which are airtightly sealed in the quartz glass bulb. The partial pressure of oxygen (O) in the quartz glass bulb is about 2.5×10−3 Pa or less and the partial pressure of the halogen gas in the quartz glass bulb is in the range between about 1×10−6 &mgr;mol/mm3 and 1×10−8 &mgr;mol/mm3. The pair of electrodes contain potassium oxide in the range between about 20 ppm and 40 ppm.

Abstract: A high pressure discharge lamp includes a quartz glass bulb having a sealing portion; and a pair of electrodes. Each electrode of the pair of electrodes is disposed so as to be opposite the other in the quartz glass bulb. The quartz glass bulb of the high pressure discharge lamp contains at least mercury and a halogen gas. The partial pressure of oxygen (O) in the quartz glass bulb is about 2.5×10−3 Pa or less and the partial pressure of the halogen gas in the quartz glass bulb is in the range between about 1×10−8 &mgr;mol/mm3 and 1×10−7 &mgr;mol/mm3.

Abstract: A light source device includes a discharge lamp having a tubular transparent bulb with sealed opposite ends for generating discharged light near a light emission center thereof, and a reflecting mirror having a reflecting surface which has a curved surface approximating a paraboloid whose focal point is positioned at the light emission center of the transparent bulb. The reflecting surface is divided by a boundary into a first curved surface extending from the boundary toward a closed end of the reflecting mirror and a second curved surface extending from the boundary toward an open end of the reflecting mirror. The first curved surface is shaped such that the angle of incidence of a ray of light emitted from the light emission center and applied to the first curved surface is progressively smaller toward the closed end, and changes of the angle of incidence are greater than changes of the angle of incidence of a ray of light on the paraboloid.

Abstract: A high pressure discharge lamp includes a quartz glass bulb and a pair of electrodes. Each electrode of the pair of electrodes is disposed so as to be opposite the other in the quartz glass bulb. The quartz glass bulb of the high pressure discharge lamp contains at least mercury and a halogen gas which are airtightly sealed in the quartz glass bulb. The partial pressure of oxygen (O) in the quartz glass bulb is about 2.5×10−3 Pa or less and the partial pressure of the halogen gas in the quartz glass bulb is in the range between about 1×10−6 &mgr;mol/mm3 and 1×10−8 &mgr;mol/mm3. The pair of electrodes contain potassium oxide in the range between about 20 ppm and 40 ppm.

Abstract: A method and device are provided for preventing deterioration of a cold cathode in an electron tube device that utilizes the cold cathode as an electron source. In accordance with the expression defining the beam current of the electron tube device, Ib<P&mgr;×Va3/2, where P&mgr; represents the perveance of an electron gun and Va represents a voltage impressed upon an accelerating electrode, the electric potential of the accelerating electrode or an adjacent electrode is maintained at the highest level of all electrodes in the electron tube at all times.

Abstract: A high pressure discharge lamp includes: a quartz glass bulb having an expanded portion and sealing portions; conductive elements, and a pair of electrodes. The conductive elements are airtightly sealed at the sealing portions of the quartz glass bulb. Each electrode of the pair of electrodes is disposed so as to be opposite the other and each electrode is connected to one of the conductive elements. An angle &thgr;1 between a tangent along the inner surface of the expanded portion at a position 0.5 mm away from an origin of one of the sealing portions along the length direction of each electrode and the direction of the length of each electrode is at least about 40°.

Abstract: A collector core of a microwave tube has an insulator and a radiator around a cylindrical outer peripheral portion thereof. The cylindrical insulator and radiator comprise a slit along a central axis of the collector core, respectively. These slits are arranged on mutually overlapped positions. Portions of the collector core corresponding to these slits are cut off so as to be flat or concave. These slits and the flat surface or the concave portion are arranged symmetrically in a section of the collector core.

Abstract: A high pressure discharge lamp includes a quartz glass bulb having a sealing portion; and a pair of electrodes. Each electrode of the pair of electrodes is disposed so as to be opposite the other in the quartz glass bulb. The quartz glass bulb of the high pressure discharge lamp contains at least mercury and a halogen gas. The partial pressure of oxygen (O) in the quartz glass bulb is about 2.5×10−3 Pa or less and the partial pressure of the halogen gas in the quartz glass bulb is in the range between about 1×10−8 &mgr;mol/mm3 and 1×10−7 &mgr;mol/mm3.

Abstract: A high pressure discharge lamp includes a quartz glass bulb, a conductive element which is sealed at a sealing portion of the bulb, and a pair of electrodes. Each electrode is disposed in the quartz glass bulb so as to be opposite the other and connected to the conductive element. A part of each electrode is sealed with the quartz glass bulb at the sealing portion so as to generate a contacting portion formed by the part of each electrode and the bulb. The maximum length, Lmax, of the contacting portion is defined as: Lmax(mm)≦/200/(P×D); and the minimum length, Lmin, of the contacting portion is defined as: Lmin(mm)≧0.8/(D2×&pgr;) or Lmin(mm)≧0.7 whichever is longer, where D is the diameter (mm) of the electrode and P is the power (W) supplied to the electrode.

Abstract: A high-pressure discharge lamp includes: a quartz glass bulb; conductive elements; and a pair of electrodes. The conductive elements are airtightly sealed at sealing portions of the quartz glass bulb. Each electrode of the pair of electrodes is disposed so as to be opposite each other and connected to one of the conductive elements. The quartz glass bulb is formed as a single piece unit by using a synthetic quartz whose viscosity is about 1013 poise or more at about 1200° C.