Abstract: A projection cathode-ray tube includes a transparent protective layer interposed between a face panel and an optical multilayered interference film. In order to prevent a browning discoloration from occurring on the glass surface of the face panel caused by a direct chemical reaction between the glass surface and the optical multilayered interference filter due to an electron bombardment, the transparent protective layer, made from inorganic materials, is disposed between the face plate and the optical multilayered interference filter. The transparent protective layer is made of silicon dioxide (SiO.sub.2) or aluminum oxide (Al.sub.2 O.sub.3), and has a thickness of 0.05 micrometer or less, or 0.5 micrometer or more, respectively.

Abstract: A projection cathode-ray tube includes a multilayered interference film interposed between a face plate and a cathode-ray tube. In order to improve brightness in a direction of the normal, then on a face plate, a phosphor layer is composed of a first layer substantially consisting of large size phosphor particles and a second layer substantially consisting of small size phosphor particles. In addition, a phosphor density of the phosphor layer is set from 20 to 50% larger than that necessary to produce a maximum brightness on a cathode-ray tube without the multilayered interference film. The phosphor particles of the phosphor layer are preferably material having a high reflectance.

Abstract: A support for photographic printing paper comprising a water resistant support comprising a raw paper with a polyethylene resin coated on both sides thereof, and a back layer provided on the support, wherein the back layer comprises:(a) colloidal silica;(b) an aqueous dispersion of a styrene-acrylate copolymer as obtained by polymerizing in the presence of a water-soluble polymer; and(c) at least one member selected from the group consisting of a water-soluble polymer compound containing a carboxylic group or a sulfone group, or its salt, and a hydrophilic organic polymer colloid.

Abstract: A high-quality projection cathode ray tube is for projecting the image, displayed on a fluorescent surface, as an enlarged image on a screen in front of the fluorescent surface through a projection lens disposed at a given distance ahead. On the inner surface of a face panel, a multilayer optical interference film including optical thin film layers of alternately superimposed high refractive and low refracte index material is provided. The outermost surface of the multilayer optical interference film is coated with a film of an inorganic material such as silicon dioxide which is optically transparent and stable with respect to the impact of an electron beam. The thickness of the transparent film is not less than 1.0 .mu.m. Even an electron beam having a high energy which has passed through the gaps of the phosphor layer loses the energy in this protective film.

Abstract: A high-quality projection cathode ray tube is for projecting the image displayed on a fluorescent surface, as an enlarged image on a screen in front of the fluorescent surface through a projection lens projection lens disposed at a given distance ahead. On the inner surface of a face panel, a multilayer optical interference film including optical thin film layers of alternately superimposed high refractive and low refracte index materials is provided. The outermost surface of the multilayer optical interference film is coated with a film of an inorganic material such as silicon dioxide which is optically transparent and stable with respect to the impact of an electron beam. The thickness of the transparent film is not less than 1.0 .mu.m. Even an electron beam having a high energy which has passed through the gaps of the phosphor layer loses the energy in this protective film.

Abstract: A cathode ray tube for producing images in red, green or blue is used for a projection type television set. A multi-layered interference filter is disposed between a face glass and a fluroescent layer so as to gather light beams from the fluorescent layer. The innermost layer of the interference layer is made of a high refractive index material such as tantalum pentaoxide which is resistant to hydrofluoric acid, so that a fluorescent material can be applied as efficiently as possible. The innermost layer of the interference filter has the optical distance expressed by the equation:nd=(2m+1).lambda..sub.h /4.lambda..sub.h =.lambda.+.lambda..sub.pwhere n stands for the refractive index of the layer, d stands for thickness of the layer, m stands for an integer larger than 0, .lambda..sub.h is the cutoff wavelength of the optical spectrum transmissitivity of the multi-layered interference film for yielding a transmissivity of fifty percent and .lambda..sub.p is 20 to 100 nm.

Abstract: In manufacturing anti-static cathode ray tubes, the concentration of a conducting filler dispersed in the coating solution is so set that a surface resistance lies within a fixed range. The baking step of the anti-static treatment is integrated in the conventional heat treatment of cathode ray tubes. Further, the salvage cap used to receive splashes of coating solution is rotated in synchronization with the tube.

Abstract: An automatic document conveying device for copying dual-sided originals includes a first conveyance path for conveying documents from a document feeder to a platen through a U-shaped path and a second conveyance path for conveying documents from the platen to the beginning of the U-shaped path to invert the documents. A document edge alignment mechanism aligns the edge of each document conveyed through the first and second conveyance paths with a document edge alignment position on the platen.

Abstract: A magnetic shielding for a cathode ray tube. A magnetic shielding case surrounds the CRT funnel and side portions of the CRT front panel. Additionally a current coil is wrapped around the CRT. In one embodiment, the coil is wrapped completely inside the shielding case. In another embodiment, the coil is wrapped partially inside the shielding case and partially outside.

Abstract: An apparatus having a cylindrical structure which has therein a rotary shaft extending along the axis of the cylindrical structure to project beyond the lengthwise end portions thereof, and a plurality of dispersion chambers and an arbitrary number of rectifying chambers arranged along the rotary shaft can be used for continuous dispersing in the manufacture of several products. Each of the dispersion chambers and rectifying chambers consists of a space defined by the circumferential surface of the rotary shaft and between adjacent distance collars. Each of the distance collars is fixed at its outer circumferential surface to the inner surface of the cylindrical structure, and forms at a part of its inner circumferential surface in cooperation with the circumferential surface of the rotary shaft an annular slit which constitutes a passage for a material current.

Abstract: A cathode ray tube comprises a face plate glass containing neodymium oxide (Nd.sub.2 O.sub.3); and a phosphor screen of plural color phosphors formed on an inner surface of said face plate glass wherein a phosphor of zinc sulfide activated with copper and aluminum (ZnS:Cu, Al) or a phosphor of zinc sulfide activated with copper, gold and aluminum (ZnS:Cu, Au, Al) is used as a green phosphor of said phosphor screen.

Abstract: An auto tracking apparatus is arranged to divide a tracing time period of one field of a frame into a plurality of time domains and to sample and hold the envelope detection output signal of a reproduced high frequency signal at every time domain. This sample-and-hold operation is successively made for the following frame and each of the sampled values is compared with the previously value sampled at the corresponding time domain. In accordance with the results of the comparison the displacement of the reproducing head is controlled at every sampling point so that a reproducing head can accurately scan the track along the center line thereof.

Abstract: A projection cathode-ray tube comprises a vacuum vessel (10) having a face plate (7), an interference thin film (20) on the inner surface of the face plate, a phosphor layer (8) on the interference thin film, a metal-back film (9) on the phosphor layer and an electron gun within the vessel. More than 30% of the total luminous flux from an emission point in the phosphor layer to which the electron beam of the electron gun is applied exists within a divergent angle of .+-. 30.degree. in the direction normal to the face plate.

Abstract: A copier or similar device is provided with an apparatus for storing and reversing or turning over a plurality of sheets used for two-sided copying. The sheets are stored between adjacent windings of a film or belt member after copying on one side thereof, after which the belt member is reversed to feed sheets one by one to the copying station such that the unprinted side of the sheets may be recorded upon.