Abstract: The present invention provides a near-infrared absorbent green glass composition which contains basic glass components and 0.6 to 1.3% total iron oxide amount in terms of Fe2O3 (T-Fe2O3), 0 to 2.0% CeO2 and, 300 ppm or less MnO expressed in units of mass and wherein a mass ratio (FeO ratio) of FeO converted into Fe2O3 relative to the T-Fe2O3 is from 0.21 to 0.35. Further the glass composition satisfies at least one of the following a) and b): a) when the glass composition is formed to have a thickness in the range of 1.3 to 2.

Abstract: An electrically heated window glass is provided, in which an electric power load may be suppressed by causing a consumed electric power for energizing a heater to be variable depending on the purpose of heating. The electrically heated window glass in accordance with the present invention comprises two glass panels laminated to each other; a plurality of heaters sandwiched between the two glass panels for heating the glass panels, the heaters being positioned in such a manner that the heaters divide the surface of the laminated glass panels into plural parts; a plurality bus bars each provided at the end portions of each of the plurality of heaters for feeding thereto; and a changeover means for switching the connection between selected one of the plurality of bus bars and a DC power supply to heat the plurality of heaters in a series connected manner or parallel connected manner.

Abstract: A glass composition that has improved infrared absorptivity while preventing the visible light transmittance from decreasing excessively. The glass composition includes: the following components, expressed in mass %: 65<SiO2?75; 0?B2O3?5; 0?Al2O3?5; 0?MgO<2; 10<CaO?15; 0?SrO?10; 0?BaO?10; 0?Li2O?5; 10?Na2O?15; 0?K2O?5; and 0?TiO2?0.5, where 10<MgO+CaO+SrO+BaO?20 and 10?Na2O+K2O?17.5; MnO 0 to 300 mass ppm; and the following components as colorants, expressed in mass %: 0.4?T—Fe2O3?1.0, where T—Fe2O3 is total iron oxide expressed as Fe2O3; and 0?CeO2?2.0. The mass ratio of FeO expressed as Fe2O3 to T—Fe2O3 is 20 to 44%. The wavelength at which a minimum transmittance is obtained in a range of 550 to 1700 nm is at least 1065 nm. The transmittance that is obtained at a wavelength of 1650 nm is not higher than the transmittance that is obtained at a wavelength of 730 nm.

Abstract: The present invention provides a near-infrared absorbent green glass composition which contains basic glass components and 0.6 to 1.3% total iron oxide amount in terms of Fe2O3 (T-Fe2O3), 0 to 2.0% CeO2 and, 300 ppm or less MnO expressed in units of mass and wherein a mass ratio (FeO ratio) of FeO converted into Fe2O3 relative to the T-Fe2O3 is from 0.21 to 0.35. Further the glass composition satisfies at least one of the following a) and b): a) when the glass composition is formed to have a thickness in the range of 1.3 to 2.

Abstract: An electrically heated window glass is provided, in which an electric power load may be suppressed by causing a consumed electric power for energizing a heater to be variable depending on the purpose of heating. The electrically heated window glass in accordance with the present invention comprises two glass panels laminated to each other; a plurality of heaters sandwiched between the two glass panels for heating the glass panels, the heaters being positioned in such a manner that the heaters divide the surface of the laminated glass panels into plural parts; a plurality bus bars each provided at the end portions of each of the plurality of heaters for feeding thereto; and a changeover means for switching the connection between selected one of the plurality of bus bars and a DC power supply to heat the plurality of heaters in a series connected manner or parallel connected manner.

Abstract: A glass composition that has improved infrared absorptivity while preventing the visible light transmittance from decreasing excessively. The glass composition includes: the following components, expressed in mass %: 65<SiO2?75; 0?B2O3?5; 0?Al2O3?5; 0?MgO<2; 10<CaO?15; 0?SrO?10; 0?BaO?10; 0?Li2O?5; 10?Na2O?15; 0?K20?5; and 0?TiO2?0.5, where 10<MgO+CaO+SrO+BaO?20 and 10?Na2O+K2O?17.5; MnO 0 to 300 mass ppm; and the following components as colorants, expressed in mass %: 0.4?T—Fe2O3?1.0, where T—Fe2O3 is total iron oxide expressed as Fe2O3; and 0?CeO2?2.0. The mass ratio of FeO expressed as Fe2O3 to T—Fe2O3 is 20 to 44%. The wavelength at which a minimum transmittance is obtained in a range of 550 to 1700 nm is at least 1065 nm. The transmittance that is obtained at a wavelength of 1650 nm is not higher than the transmittance that is obtained at a wavelength of 730 nm.

Abstract: A dew condensation detecting apparatus is independent of a wavelength of a detected light beam, and has a heat capacity of the detecting apparatus body so as to miniaturize the apparatus. A light beam is introduced from a light emitting element into the transparent plate and travels through the transparent plate with repetitions of total reflection. It is then detected by a light receiving element to detect a degree of dew condensation on a surface of the transparent plate in accordance with a variation in detected light quantity. The transparent plate is formed of two sheet glasses bonded to each other by an intermediate film, a part of which is a reflection film. A micro-mirror array for turn-back reflection, composed of oblique reflection surfaces inclined to the surfaces of the spaced sheet glasses, is provided near one end of the reflection film.

Abstract: A glass antenna system for an automobile comprises a T-shaped or pi-shaped dynamic impedance matching circuit. Another system comprises an integrated circuit consisting of T-shaped FM and AM matching circuits each connected to a common cable. The T-shaped or pi-shaped matching circuit comprises at least two varactor diodes each applied to a channel selection voltage to match the FM antenna impedance with that of the FM receiver including that of the transmission cable.

Abstract: A window glass antenna device defrosting heaters for use as part of a reception antenna on an automobile window glass panel. The defrosting heaters include at least first and second heaters each comprising a plurality of heater wires disposed on the window glass panel, a first bus bar interconnecting ends of the heater wires, and a second bus bar interconnecting opposite ends of the heater wires. A first choke coil is connected between the first bus bars of the first and second heaters and a battery, and disposed near the first bus bars, and a second choke coil is connected between the second bus bars of the first and second heaters and the battery, and disposed near the second bus bars.

Abstract: A glass antenna system for an automobile comprises a T-shaped or pi-shaped dynamic impedance matching circuit. Another system comprises an integrated circuit consisting of T-shaped FM and AM matching circuits each connected to a common cable. The T-shaped or pi-shaped matching circuit comprises at least two varactor diodes each applied to a channel selection voltage to match the FM antenna impedance with that of the FM receiver including that of the transmission cable.

Abstract: A window glass antenna has a receiving antenna pattern and a loop-shaped guard pattern of an electrically conductive material disposed on a sheet of window glass around the receiving antenna pattern. The guard pattern is positioned on the sheet of window glass for intensive electromagnetic and electrostatic coupling between the guard pattern and an electric conductor disposed around the sheet of window glass. The guard pattern and the electric conductor are spaced from each other by a distance of 2 mm or less. The guard pattern has a width of 1 mm or more.

Abstract: Electrically conductive patterns such as antenna patterns on window glass are inspected for a wire break or a short circuit. The impedances between an electrically conductive pattern and an electrically conductive layer on an inspective table are measured at predetermined frequencies, or the levels of signals reflected from the electrically conductive pattern are measured at predetermined frequencies. A decision unit determines whether the electrically conductive pattern is acceptable or not based on the frequency characteristics of the electrically conductive pattern and the reference frequency characteristics of a reference electrically conductive pattern.

Abstract: A glass antenna for an automobile uses a coil connected directly to a bus for defogging heaters as an FM subsidiary antenna and a T-shaped impedance matching circuit to provide a monotone change of impedance within the FM frequency band. A reverse T-shaped FM main antenna is employed in conjunction with the FM subsidiary antenna to provide a diversity system to enhance receiving sensitivity in entire directions. The T-shaped matching circuit comprises at least two varactor diodes each applied to a channel selection voltage to match the FM antenna impedance with that of the FM receiver including that of the transmission cable.

Abstract: A window glass antenna device is combined with a laminated window glass panel, such as a rear window glass panel of an automobile, which has a pair of inner and outer glass layers bonded to each other. The window glass antenna device has, as antenna elements, a plurality of defroster heater wires disposed between the glass layers. A pair of spaced first and second bus bars is disposed between the glass layers, the first bus bar electrically interconnecting first ends of the defroster heater wires and the second bus bar electrically interconnecting second ends of the defroster heater wires. A first electrode is disposed on an outer surface of the inner glass layer and joined to the second bus bar for supplying electric energy to heat the defroster heater wires, and a second electrode is disposed on the outer surface of the inner glass layer in confronting relationship to the first bus bar.

Abstract: A first inductance element is series-connected into a reception signal path of an antenna circuit between an antenna element and a receiver. A second inductance element is arranged to connect the antenna circuit to ground. These inductance elements series- and parallel-resonate with a ground stray capacitance of the antenna circuit including a feeder cable, so that reduction of gain of the reception system due to the stray capacitance is improved. A damping resistor is coupled to the second inductance element. The system has high reception sensitivity over a wide reception range with eliminating use of a pre-amplifier.

Abstract: A pair of antenna conductors are formed on upper and lower blank portions outside an area where defogging heater wires are attached on a window glass of a motor vehicle. One of the antenna conductors is RF-coupled with the defogging heater wires and a feed terminal thereof is located at a lateral side of the glass. The other antenna conductor has a feed terminal located at another lateral side of the glass. A pair of reception signals complement with each other in directivity due to asymmetric characteristic of the antenna conductors and are used in a diversity reception system for obtaining a nondirectional reception characteristic.

Abstract: An inductance element is arranged to parallel resonate with a ground stray capacitance component of an antenna element on a motor vehicle and a feeder cable to a receiver. Matching means is provided to compensate for a Q-factor of the parallel resonance for improving a reception gain over a wide range in a reception band.

Abstract: A first antenna conductor is provided onto a margin area of a group of defogging heater wires on a surface of a laminated window glass. A second antenna conductor is provided into an intermediate layer of the laminated glass. The former is tuned to receive waves in lower reception band and the latter is assigned to higher reception band with its conductor arranged to cross the heater wires. The first and second antenna conductors are coupled to obtain a good bandwidth characteristic even in relatively narrow space for conductors.

Abstract: A glass window antenna for use in a motor vehicle provides satisfactory antenna characteristics while making best use of the space of a glass window with a heating conductor as the main antenna element which is heated by a pair of power supply lines through choke coils. In a preferred embodiment, a capacitor is connected across the power supply lines at a position between the choke coils and the heating conductor to minimize the loss or leakage of radio signals from the heating conductor through the choke coils. A symmetrical pair of wires coupled with each other is formed on the glass window and connected to ends of the heating conductor to improve a radio wave reception gain.

Abstract: A vehicle window glass is provided with an antenna to be fit in a window frame of a vehicle such as an automobile. The antenna comprises a plurality of antenna elements which are disposed on a portion of the glass extending generally alongside the window frame. Thus, the antenna elements are spaced from the window frame at a reference or ground potential and preferably close to the sides of the frame. The antenna elements are each designed to have a different length from one another so that they can receive radio waves covering a relatively broad frequency band with a relatively high sensitivity.