Abstract: A fiber light source includes a solid-state light source, a wavelength convertor, and an optical fiber. The solid-state light source is configured to emit first light, the first light including blue light with a peak wavelength in a range of 430 to 470 nm, inclusive, and green light with a peak wavelength in a range of 480 to 550 nm, inclusive. The wavelength convertor is disposed on the light output side or the light incident side of the optical fiber and contains a red phosphor. The red phosphor includes Ce as a luminescent center, and is excited by at least part of the green light to emit second light. The second light has a spectrum with a peak wavelength in a range of 600 to 700 nm, inclusive. The red phosphor contains a nitride or an oxynitride as a host material.

Abstract: A phosphor layer having improved contrast and brightness characteristics and a display device including the same are provided. The phosphor layer is made out of an ultra-fine pigment, a dispersant, a phosphor, a photosensitizer and a binder. The phosphor has a uniform distribution along the thickness of the phosphor layer, and the pigment varies in content over the thickness of the phosphor layer. A method of forming the phosphor layer is based on existing phosphor layer processes and includes a reduced number of processing steps than a filter screen method, thereby markedly lowering the manufacturing costs. The phosphor layer can be used in a cathode ray tube, a plasma display panel, a field emission display, and an organic electroluminescent device.

Abstract: The present invention relates to a tracking picture tube of the type in which comb-shaped electrodes or optical detecting means (12, 13) are used for generating a signal related to the position of an electron beam with respect to the strips (5). The tube is characterized in that the deflection unit is arranged to deflect the beams (21r, 21g, 21b) onto selected strips (22r, 22g, 22b) having coincident sides which neighbour finger portions (14, 15) of the same electrode (12, 13), and the selected strips (22r, 22g, 22b), excited by the electron beams, are separated by at least one unexcited strip, respectively.

Abstract: Picture display device (1) comprising a cathode ray tube (2) whose display screen (4) is provided with parallel image lines (10) along which an electron beam (5) is scanned, and with pairs of first and second phosphorescent index elements extending along opposed sides of each image line (10). The device also comprises a pair of photodetectors (31,32) for generating index signals indicative of the amount of irradiation by the electron beam (5) of said index elements. An error signal is constructed based on a difference of said index signals for correcting the shape and/or the position of the electron beam (5) on the screen. The index signal of one of the photodetectors is indicative of the amount of irradiation of both the first and the second index elements (11, 12), which improves the detection efficiency of said detector and the signal/noise ratio of its index signal. This results in a better error signal and thus in a better image quality.

Abstract: A picture display device of the index type comprises a cathode ray tube (1) and a display window with a display screen (10) having phosphor patterns comprising parallel aligned phosphor lines (R,G,B), and with an index system (20) having a plurality of index elements (21) extending substantially parallel to the phosphor lines. The electron beam(s) (6,7,8) are deflected across the display screen (10) parallel to the phosphor lines and along and across the phospor lines. The display device has no color selection electrode in front of the display screen. The phosphor lines are arranged in the color sequence A-B-C-B-A-B-C, etc., where A, B and C stand for red, green and blue phosphors or any mutation of said colors, and, in operation, the video lines overlap such that each B phosphor line is written in a single video line and each A and C phosphor line is written by two video lines.

Abstract: In color display tubes (1) with a dotted shadow mask (13) structure and an in-line electron gun (10), the geometry of the screen (6) and the deflection field produced by the deflection unit (11) cause triad rotation, which is a rotation of the three phosphor dots (red, green and blue) corresponding to one aperture of the shadow mask (13) with respect to the horizontal scan lines (35). This problem can be solved by giving the horizontal lines (35) a curved shape. However, in the prior art situation a parabolic shape is used, leading to severe moiré problems, because the vertical pitch asv (38) is influenced too strongly at the vertical screen edges. This problem can be overcome by using fourth order or even sixth order terms in the shape of the horizontal lines (35). A pure fourth order function reduces the vertical pitch asv 38 variation by 50% with respect to the parabolic prior-art situation, and a pure sixth order function even leads to a reduction by 67%.

Abstract: Picture display device comprising a cathode ray tube whose display screen (10) is provided with index electrodes (20, 21) comprising elongated conducting elements disposed substantially parallel to an axis of symmetry (50) of the display screen (10). In operation, the magnetic field of the deflection system of the cathode ray tube induces unwanted crosstalk on said index electrodes (20, 21). By cross-connecting one end (30a) of a conducting element (31) of an index electrode (20) to the opposite side end (40a) of another conducting element (41) of said index electrode (20), said crosstalk on said index electrode (20) is reduced.

Abstract: The present invention relates to a tracking picture tube of the type in which comb-shaped electrodes or optical detecting means (22, 23) are used for generating a signal relative to the position of electron beams (9r, 9g, 9b) deflected onto phosphor strips (5r, 5g, 5b). The tube is characterized in that a first peripheral (uppermost) strip (5r) of said group of adjacent strips borders only finger portions (24a, 24b) of the first detecting means (22) in said pair of detecting means, and a second peripheral (lowermost) strip (5b) of said group of adjacent strips borders only finger portions (25a, 25b) of the second electrode (23) in said pair of detecting means.

Abstract: Picture display device comprising a cathode ray tube whose display screen (10) is provided with index electrodes (20, 21) comprising elongated conducting elements disposed substantially parallel to an axis of symmetry (50) of the display screen (10). In operation, the magnetic field of the deflection system of the cathode ray tube induces unwanted crosstalk on said index electrodes (20, 21). By cross-connecting one end (30a) of a conducting element (31) of an index electrode (20) to the opposite side end (40a) of another conducting element (41) of said index electrode (20), said crosstalk on said index electrode (20) is reduced.

Abstract: A display screen may be formed with a moth-eye like array of elements of sufficiently small size to reduce glare from ambient light while passing outbound image light substantially unaffected. The screen may be used in direct view and projection displays.

Abstract: A display screen may be formed with a moth-eye like array of elements of sufficiently small size to reduce glare from ambient light while passing outbound image light substantially unaffected. The screen may be used in direct view and projection displays.

Abstract: A beam index type cathode ray tube having an improved alignment of index stripes, phosphor stripes and matrix stripes. An alignment of the index stripes, the color stripes and the matrix stripes is confirmed during an exposure processing state of the index stripes by using confirming points formed in the screen. An exposed state of the screen is determined by optically testing an alignment of the confirming points and a master screen. On determining that a misalignment exists, the relative positions of the screen and the master screen are adjusted to remove the misalignment.

Abstract: A color cathode ray tube has a vacuum enclosure including a panel unit having a fluorescent film formed on an inner face, the fluorescent film consisting of densely arrayed three color dot trios of a fluorescent material. A shadow mask is mounted in the vicinity of the fluorescent film. The color cathode ray tube further includes a neck unit housing an electron gun for emitting three electron beams and a funnel unit for joining the panel unit and the neck unit. The panel unit has a diagonal diameter of not more than 52 cm and an effective display area on an outer face of the panel unit has a diagonal radius of curvature of not less than 1,300 mm. The dot trios of the fluorescent material are horizontally arrayed in a number of approximately at least 1600, and a cover film is applied to the panel unit to lower optical transmittance.

Abstract: A system for displaying a color broadcast television signal is provided. The system employs a cathode ray tube (CRT) which has only one electron gun and does not have a mask. The faceplate of the CRT has red, green, and blue phosphor stripes which form triads. A beam positioning gap, which may be patterned, is associated with each triad. By scanning the tube's electron beam along the beam positioning gap, vertical position information is obtained which is then used to accurately position the beam on the phosphor stripes as the stripes are scanned. Flyback of the electron beam can be avoided by scanning the phosphor stripes and the beam positioning gap in a serpentine pattern.

Abstract: First and second index signal phosphor layers are formed on a phosphor screen that is formed on the inner surface of a face plate. A rear plate is provided with first and second light sensing units for detecting signal lights from the first and second index signal phosphor layers, respectively. Each first light sensing unit includes a first light collecting plate, which radiates absorbing light having a radiation peak wavelength substantially equal to or shorter than the radiation wavelength of each first index signal phosphor layer. Each second light sensing unit includes a second light collecting plate, which radiates absorbing light having a radiation peak wavelength substantially equal to or shorter than the radiation wavelength of each second index signal phosphor layer.

Abstract: A screen for a beam index tube includes a fluorescent surface having a pattern of color stripes respectively producing red, green, and blue light in unit areas within the stripes in response to an incident electron beam and index unit areas regularly arranged in the pattern, the color stripes being arranged side-by-side and along a vertical direction with color unit areas of vertical stripes being in registration along a horizontal direction, each color unit area being spaced in the horizontal and vertical directions from the nearest color unit area by one unit area, and the index unit areas being disposed among the color unit areas and spaced from the nearest index unit area by three unit areas in the horizontal direction and one unit area in the vertical direction. A beam index tube may include the screen in combination with a tube assembly and an electron gun.

Abstract: A cathode ray tube control apparatus includes phosphor display screen, three electron guns for emitting R, G, B electron beams to the display screen, a shadow mask placed between the electron guns and the display screen, and index phosphors deposited on the shadow mask and having at least two line elements diagonal to a horizontal scanning direction of the electron beam for generating a signal according to the electron beam scan. Further provided are detector for detecting beam crossing points over the index phosphor, and correction circuit for correcting the deflection of the electron beam based on the detected beam crossing points.

Abstract: An electron gun comprises a cathode made of an emissive material with an active face emitting electrons through a control grid that is placed before the active face but has no contact with it. The active face has emissive zones and non-emissive zones. The non-emissive zones are formed by grooves hollowed out of the emissive material. The control grid has solid parts that directly face the grooves. Application to electron guns with reduced heating of the control grid. FIG. 5 .

Abstract: A color reference CRT of the type employing a screen of a pattern of individual phosphor elements of different color components, is produced by adjusting the screen weights of the different color components to achieve the desired reference color when the screen is scanned by an electron beam of predetermined beam current and anode potential.

Abstract: Described is a beam index type color cathode ray tube in which at least one of tricolor phosphor stripes, that is the red, blue and green stripes, is different in width from the other color phosphor stripes, and m index stripes are associated with n sets or triplets of the color phosphor stripes. The widthwise center-to-center distance between the adjoining color phosphor stripes is set to a constant value. Each index stripe is of a width lesser than the width of the guard band provided between adjoining ones of the color phosphor stripes, and is provided at the widthwise center of the associated guard band. The arrangement provides index signals of sufficient intensity, while assuring a positive color switching.

Abstract: A color cathode ray tube includes an automatic convergence unit employing index elements on the reverse surface of a color-selective electrode. The paste used for forming the index elements has a composition consisting essentially of index phosphors, an inorganic adhesive and water to assure the adhesive force of the index elements onto the color selective electrode to prevent peeling of the index elements while facilitating the coating operation for formation of the index elements.

Abstract: A photodetector including a planar light guide of a polygonal shape in which organic phosphor is dispersed in a transparent support material, and a pair of photoelectric conversion elements such that light having a wavelength range for exciting the organic phosphor is introduced into the light guide and light generated from the organic phosphor upon the excitation is guided to the photoelectric conversion elements sensitive to a wavelength of the light generated from the organic phosphor. The light guide is formed, at opposite end portions of its one side, with a pair of light emitting surfaces and the photoelectric conversion elements are, respectively, provided at the light emitting end surfaces such that a light receiving surface of each of the photoelectric conversion elements confronts each of the light emitting end surfaces.

Abstract: A flat CRT having a phosphor screen inclined with respect to the center axis of an electron beam and formed by applying phosphors to the inner surface of a tube wall. The tube inner surface is defined by rotating a plurality of logarithmic spiral curves having a constant angle of incidence and present in the x-y plane of a polar coordinate system in which the deflection center of the electron beam is its origin, the center axis extends through the origin and serves as the x-axis, and the y-axis extends through the origin and intersects the x-axis at right angles therewith. The spiral curves are rotated about the y-axis each through a specified angle to obtain a group of logarithmic curves defining the tube inner surface.

Abstract: A beam-index type color cathode ray tube device which includes a front panel portion, a screen panel portion which faces the front panel portion, a phosphor screen including a plurality of index phosphor stripes fixed to the inner surface of the screen panel portion and extending at regularly spaced intervals. A porous inorganic layer is fixed on the inner surface of the screen panel portion and extends between each adjoining pair of the index phosphor stripes. A metallic reflecting layer covers the index phosphor stripes and the porous inorganic layer. A plurality of color phosphor stripes is applied to the metallic reflecting layer in a predetermined pattern. A photodetecting portion disposed at the outside of the screen panel portion receives fluorescence from the actuation of the index phosphor stripes.

Abstract: A beam-index type color cathode ray tube device which comprises a color cathode ray tube having a front panel portion and a screen panel portion provided with a phosphor screen shaped rectangularly to include a plurality of color phosphor stripes accompanied with index phosphor on its inner surface facing the front panel portion, a luminescence receiving plate member disposed at the outside of said screen panel portion of receiving fluorescence from the index phosphor and producing secondary fluorescence. The luminescence receiving plate member is shaped to have first and second cut-out side portions which are positioned to be close respectively to two corners of the phosphor screen each including a part of one of the top and bottom ends of the same so as to look toward a central part of the luminescence receiving plate member. A first fluorescence detector is attached to the first cut-out side portion for detecting the secondary fluorescence produced in the luminescence receiving plate member.

Abstract: A flat color CRT having a phosphor screen comprises red, green and, blue primary phosphor color stripes arranged at a spacing, and phosphor index stripes arranged in some of the spaces between the phosphor color stripes in a definite relation thereto. A black nonluminescent substance is provided between the phosphor index stripes and positioned at least in the spaces between the phosphor color stripes, and a metallic layer of sufficient thickness formed on the inner side of a tube panel and positioned in a corresponding relationship to the phosphor color stripes.

Abstract: An index type color picture tube having a stripe type fluorescent screen with strips of a zinc sulfide-based green color phosphor, a zinc sulfide-based blue color phosphor, a red color phosphor which is a mixture of a Y.sub.2 O.sub.2 S:Eu phosphor containing not more than 2 ppm of Tb and a Y.sub.2 O.sub.3 :Eu phosphor, or a Y.sub.2 O.sub.2 S:Eu phosphor containing 5 to 30 ppm of Tb, and a phosphor for index detection has a uniform current-brightness characteristic of tricolor phosphors, and a less variation in white color tone of the picture reproduced over a range of from low current to high current.

Abstract: A flat color CRT wherein a single beam emitted from an electron gun scans the inner surface of a tube wall and which includes a phosphor screen formed on the walls inner surface. The phosphor screen comprises a nonluminescent substance and phosphor index stripes with the substance interposed between the stripes. Red, green, blue primary phosphor color stripes have a sufficient thickness and are arranged repeatedly on the nonluminescent substance at a spacing in a definite relation to the phosphor index stripes.

Abstract: A television receiver in which a plurality of picture-displaying fluorescent lines (3), which are disposed on a screen (2) as the display surface of a cathode ray-tube so as to extend in the horizontal direction (in the direction of the arrow X) as the beam main-scanning direction, and in the vertical direction (in the direction of the arrow Y) as the beam sub-scanning direction, and a single electron beam is arranged to scan across the screen (2) to display a picture. The television receiver has two kinds of beam detection stripes (5A), (5B) disposed in each respective guard band portion between adjacent fluorescent lines (3) so as to be parallel to the fluorescent lines (3). On the basis of beam detection signals independently taken from the beam detection stripes (5A), (5B) in correspondence to beam spots (S) of the electron beam on the screen (2), the vertical positions (in the direction of the arrow Y) of the electron beam spots (S) with respect to the fluorescent lines (3) are controlled.

Abstract: In an index type color picture tube including a stripe type fluorescent screen having stripe-shaped phosphor layers for green, blue and red color and a stripe-shaped phosphor layer for index detection, the phosphor for red color phosphor layer comprises a Y.sub.2 O.sub.2 S:Eu phosphor containing 0.01 to 3 ppm of either one or both of Tb and Pr.

Abstract: A color projector apparatus including a single cathode ray tube of index-type having a first transparent panel with phosphor elements of three primary colors and an indexing element formed on the inner surface thereof, a second transparent panel located in front of the first transparent panel of cathode ray tube, a metal frame-shape spacer for supporting the second transparent panel, and a transparent liquid coolant filled into the space between the first and second transparent panels.

Abstract: A frontal light extraction type beam-indexing color picture tube arrangement comprises a phosphor screen which is formed on the inner surface of the tube panel and includes an array of color phosphor stripes each of which has an appropriate afterglow time and an array of index phosphor stripes each of which has a short afterglow time and emits a light index signal representative of the scanning position of an electron beam in the forward direction of the tube panel. A photoelectric converter for receiving the light index signal is provided in front of the tube panel.

Abstract: A beam-indexing color picture tube includes a gun for producing an electron beam that scans across a screen of the tube and a plurality of index phosphor stripes provided on the screen for emitting near-ultraviolet index lights. The near-ultraviolet index lights are transmitted through a window formed in the tube to a detector. The detector is formed by a planar fluorescent collector doped with fluorescent material for absorbing the near-ultraviolet index lights, and at the same time, generating secondary index lights having different wavelength than that of the near-ultraviolet index lights. A silicon p-i-n photodiode is mounted on the planar fluorescent collector for detecting the secondary index lights and for generating electrical signal representing the near-ultraviolet index lights.

Abstract: A beam index color cathode ray tube is provided with a screen arranged on the inner surface of a face plate portion and an electron gun arranged in a neck portion thereof. This screen comprises phosphor stripes and index stripes. The electron gun comprises at least a cathode and two electrodes forming a focusing lens. The focusing lens of the electron gun is formed between at least two electrodes provided with transversely elongate openings having their direction of elongation in the width direction of the phosphor stripes or index stripes.

Abstract: Programmable power supplies are made responsive to beam-index and timing signals in order to automatically control the size and position of the display on a cathode ray tube. The high voltage power supply is also made programmable, responsive to video signal content, to reduce the energy stored in the high voltage circuits. Savings in energy consumption are also obtained by efficiently modulating the target screen of a beam-index type color cathode ray tube. Energy lost at the target screen is less than 10% compared to approximately 70% for a conventional color tube, an improvement factor of 7:1 or more.

Abstract: A beam-indexing color image-presentation cathode ray tube comprises color-phosphor stripes arranged in a regular order and differently responsive to impingement by electron beams to produce light of different colors and index-phosphor stripes arranged to have a predetermined geometric relation to the color-phosphor stripes and responsive to impingement by the electron beams to produce index signals, in which the index-phosphor stripes comprises a first index-phosphor stripe, a second index-phosphor stripe and a third index-phosphor stripe, the pitch of the second index-phosphor stripe is three times as large as the pitch of the third index-phosphor stripe, and the first index-phosphor stripe is wider in its width than the second index-phosphor stripe.

Abstract: An evacuated envelope has a rectangular display section and a gun section at one edge of the display section. The display section includes front and back walls which are generally rectangular, in closely spaced, parallel relation, and a plurality of spaced, parallel support walls between the front and back walls forming a plurality of parallel channels. At one side of the display section is at least one keying channel which extends parallel to the channels of the display section. The gun section extends across one end of the channels and includes therein gun structure which will direct electrons into the channels.

Abstract: A cathode ray tube gun structure for minor deflection of an electron beam and employing electrostatic beam deflecting electrodes ultimately controlled by a deflection signal at a low voltage level for minor deflection of the beam. The minor beam deflection electrodes may be positioned in the low beam potential focus region of the gun to provide for minor deflection of the beam. The electrodes may be enclosed in a cylindrical electrode, the latter being used for focusing the beam, or the cylindrical electrode may be omitted in which case focusing and deflection functions are provided by the minor beam deflection electrodes. The minor beam deflection electrodes may be positioned in a high beam potential region, in which case low voltage control is provided by capacitive coupling through the envelope of the tube. The deflection electrodes may also be employed as the conventional second grid structure in a cathode ray tube gun structure.

Abstract: A method and apparatus are provided for alignment of an electron beam with precisely located areas of a major surface of a member. Marks of predetermined shape are formed of X-ray producing material and are positioned adjacent the major surface of the member which is preferably substantially transparent to the X-rays generated by the marks. An electron beam to be aligned has at least one alignment beam portion of a predetermined cross-sectional shape and preferably corresponds in dimensional accuracy to the alignment accuracy desired. The X-ray emissions are detected by a detector means preferably positioned adjacent the opposite surface of the member. The position of the electron beam is moved relative to the member while continuing said detection until the X-ray emissions detected indicate alignment of the alignment beam portion with a corresponding mark.

Abstract: A cathode ray tube for use with color image signal processing system, which comprises: an evacuated envelope having a transparent faceplate; an electron gun positioned within the envelope for emitting an electron beam toward the faceplate; a deflection means for deflecting the electron beam so that the electron beam vertically and horizontally scans the faceplate; and an index strip member including a plurality of successively arranged index strips positioned at an upper or lower surface of the faceplate, each of the index strips extending in a direction perpendicular to the horizontal scanning direction of the electron beam, and a pair of start and stop index strips each positioned at one side portion of the faceplate and elongated in parallel with the index strips and in substantially the same extent as that of the vertical deflection of the electron beam.