Abstract:
A plasma display panel (200) of the present invention includes a first panel (1) and a second panel (8). A discharge space (14) is formed between the first panel (1) and the second panel (8). In the plasma display panel (200), an electron emitting material (20) is disposed to face the discharge space (14). The electron emitting material (20) contains Sn, an alkali metal, O (oxygen), and at least one element selected from the group consisting of Ca, Sr, and Ba.
Abstract:
Disclosed is a glass composition composed of an oxide glass wherein the percentages of constitutional elements other than oxygen (O) expressed in atomic % are as follows: boron (B) is not less than 56% and not more than 72%; silicon (Si) is not less than 0% and not more than 15%; Zinc (Zn) is not less than 0% and not more than 18%; potassium (K) is not less than 8% and not more than 20%; and the total of K, sodium (Na) and lithium (Li) is not less than 12% and not more than 20%. This glass composition further may contain at least one of magnesium (Mg), calcium (Ca), strontium (Sr) and barium (Ba) in an amount of more than 0% and not more than 5%, and molybdenum (Mo) and/or tungsten (W) in an amount of more than 0% and not more than 3%.
Abstract:
An oxide ceramic material is provided to contain aluminum oxide as a principal component, and at least one selected from A and B shown below as an auxiliary component: A: niobium oxide and copper oxide B: copper oxide, titanium oxide, and silver oxide. With this, it is possible to provide an oxide ceramic material having sinterability at a low temperature and a high heat conductivity, as well as a ceramic substrate, a ceramic laminate device, and a power amplifier module employing the same.
Abstract:
A low-cost and small-size image reader incorporating a variable power function. An original document is irradiated with the light from a light source. The light is reflected in a reading position. The reflected light is incident on a mirror block via a fixed mirror. The light incident on the mirror block is deflected by a pair of mirrors. An optical path is thus extended and shortened in its length without taking a space in the horizontal directions of the reader. The mirror block and the lens are provided with driving devices. The mirror block and the lens are moved to adjust a focal point and a magnification.
Abstract:
A porous polytetrafluoroethylene film which is excellent as an air filter used in clean rooms in a semiconductor industry, which is suitable for the collection of microparticles floating in a gas such as air and exhibits a low pressure drop is provided. The film has an average pore size of from 0.2 to 0.4 .mu.m and exhibits a pressure drop of from 20 to 50 mmH.sub.2 O when air is passed through it at a flow rate of 5.3 cm/sec. The film is prepared by stretching biaxially unsintered polytetrafluoroethylene at specific temperatures.
Abstract:
A polytetrafluoroethylene porous film, which is prepared by stretching a semisintered polytetrafluoroethylene material and heating the stretched material at a temperature higher than the melting point of sintered polytetrafluoroethylene, has an area ratio of fibrils to nodes of from 99:1 to 75:25, an average fibril diameter of from 0.05 to 0.2 .mu.m, a largest node area of not larger than 2 .mu.m.sup.2 and an average pore size of from 0.2 to 0.5 .mu.m and achieves low pressure loss.
Abstract:
A PTC composition comprising at least one polymer, from 5% to 45% by volume of electrically conductive or semiconductive particles having a room temperature electric conductivity of at least 10.sup.2 [s/m] dispersed in said polymer, and from 0.2% to 20% by volume of thermally conductive particles having a room temperature electric conductivity of no more than 10.sup.-3 [s/m] and a thermal conductivity of at least 20 [w/m.multidot.k] dispersed in said polymer. A PTC device using such a PTC composition has a high ratio of peak resistance to room temperature resistance, and exhibits high safety.
Abstract:
A fluidity controlling agent for paints is provided which comprises a product obtained by reacting paratoluidine and hexamethylene diisocyanate at a particular equivalent ratio (NH.sub.2 NCO) and gives thixotropic properties to the paint without sagging at a large coating film thickness.
Abstract:
A magnetic recording apparatus for recording two kinds of mutually different information signals on independent tracks of a magnetic tape comprises first through fourth rotary magnetic heads. The third and fourth heads are mounted on a rotary body at positions respectively in vicinities of the first and second heads along a rotating direction of the rotary body. The height positions of the third and fourth heads on the rotary body are different from the height positions of the first and second head. An extremely narrow guard band or no guard band is formed between two adjacent tracks recorded with the same kind of information signal. On the other hand, a wide guard band is formed between two adjacent tracks recorded with different kinds of information signals.
Abstract:
A magnetic recording apparatus for carrying out a recording by selectively using one of two kinds of recording systems comprises first through fourth rotary magnetic heads, a first circuit for producing an FM luminance signal, second and third circuits for producing first and second frequency division multiplexed signals, and a switching circuit. The first and second heads are mounted on a rotary body at mutually opposing positions, and have the same height position. The third and fourth heads are mounted on the rotary body at mutually opposing positions respectively in vicinities of the first and second heads along a rotating direction of the rotary body, and have the same height position. The switching circuit selectively supplies the output signals of the first and second circuits to the first through fourth heads when a luminance/color separation recording system is selected as the recording system, and selectively supplies the output signal of the third circuit to the first and second heads or to the third and fourth heads when a low band conversion color recording system is selected as the recording system.