Abstract: A temperature and wear sensor for a brake is fixed disposed in a brake cylinder, and the sensor has a slider to be pressed on the side face of a piston of the brake cylinder and a temperature sensing device; thereby wear out of brake lining and overheating of the brake fluid are detected through a pair of lead out wires, and the sensor can be used permanently.

Abstract: A positive-temperature-coefficient (PTC) thermistor heating element in which joints between metal heat radiating means and the electrodes on a positive-temperature-coefficient thermistor element are attained only with an electrically insulative adhesive in such a way that prior to and during the curing step, the heat radiating means are pressed against the electrodes to establish thereby electrical contacts at least partially between them. The heat radiating means also function as current paths to and out, respectively, of the thermistor element. The PTC thermistor heating device is simple in construction and easy to fabricate at less cost yet has a high and stable thermal output.

Abstract: A positive-temperature-coefficient (PTC) thermistor heating element in which joints between metal heat radiating means and the electrodes on a positive-temperature-coefficient thermistor element are attained only with an electrically insulative adhesive in such a way that prior to and during the curing step, the heat radiating means are pressed against the electrodes to establish thereby electrical contacts at least partially between them. The heat radiating means also function as current paths to and out, respectively, of the thermistor element. The PTC thermistor heating device is simple in construction and easy to fabricate at less cost yet has a high and stable thermal output.

Abstract: An electroluminescent panel comprising a pair of electrodes having sandwiched therebetween a multi-layer comprising an insulating layer in contact with one of said electrodes, an electroluminescent layer and an intermediate layer formed from a conductive material which is in intimate contact with the electroluminescent layer but is out of contact with both of the electrodes. Due to the provision of the intermediate layer, the brightness of the electroluminescent panel can be kept high for a long time.

Abstract: An electrophoretic matrix display panel is composed of a first insulating substrate having a first set of strip-shaped parallel electrodes thereon and a voltage non-linear resistive layer on the first set of parallel electrodes. Dot-shaped intermediate electrodes isolated from each other are positioned on the voltage non-linear resistive layer, and an electrophoretic suspension layer consisting of a suspending medium and at least one electrophoretic material suspended therein is placed over the intermediate electrodes and contained thereon by a frame. A second set of parallel electrodes extending in a direction transverse to the direction of the first set of electrodes is placed over the frame and the electrophoretic suspension layer, and a second insulating substrate is provided thereover. The two sets of parallel electrodes cross to define cross points at which the dot-shaped intermediate electrodes are positioned and which constitute picture elements of the matrix display panel.

Abstract: This invention provides a method for preparing a photoconductive powder comprising firing a combined starting mixture of CdSe, ZnS, ZnO, a Cu or Ag salt, and a Cd or Zn chloride or bromide as a flux, and preferably a Mn salt also, at a temperature higher than the melting point of the flux, cooling the fired product, and re-firing the cooled product in a sulfur vapor containing atmosphere. The photoconductive powder obtained by this method has high photosensitivity, high threshold voltage and fine particle size.

Abstract: This invention relates to an X-Y matrix type electroluminescent display panel. The panel includes a transparent insulating substrate, transparent and parallel X-electrodes of strip shape provided on said transparent insulating substrate, a D.C. electroluminescent layer provided on said transparent parallel electrodes; parallel Y-electrodes of strip shape provided on said D.C. electroluminescent layer, the direction of said Y-electrodes being perpendicular to that of said X-electrodes, said X- and Y-electrodes and said D.C. electroluminescent layer defining display elements at the intersections of said X- and Y-electrodes; and a mesh-shaped insulating layer, preferably of black color, for insulating said display elements from each other at least in the vicinity of said X-electrodes. Because of the mesh-shaped insulating layer, it becomes possible to achieve uniform "forming" of said D.C. electroluminescent layer and to improve the brightness and contrast of the resultant display panel.

Abstract: A method of making a manganese-activated zinc sulphide electroluminescent powder for D.C. excitation which contributes to a high electroluminescent brightness, high breakdown voltage and high uniformity and fineness of luminosity of the luminous area in an electroluminescent panel. The feature of this method is to fire a mixture of raw zinc sulphide powder and a manganese compound in an atmosphere of carbon disulphide with a carrier gas.

Abstract: A photoconductive layer having superior characteristics is made by steps of suspending uniformly photoconductive particles in a viscous solution by stirring, pouring the stirred mixture of the photoconductive particles, binder and solvent on a substrate which is put horizontally at a bottom of a container, precipitating the photoconductive particles on the surface of the substrate so as to form a wet photoconductive layer, removing the clear solution on the wet photoconductive layer, drying the wet photoconductive layer and baking the dried photoconductive layer.