Abstract: A color cathode-ray tube has an in-line type electron gun. Third, fourth, and fifth electrodes form a sub-main lens, and a sixth electrode forms a main lens with the fifth electrode for focusing the three electron beams onto the phosphor screen. The second and fourth electrodes are electrically connected together and the third and fifth electrodes are electrically connected together. A ratio A of an axial length of the fourth G4 electrode to a diameter of the opening of the fourth electrode and a ratio B of an axial length of the fifth G5 electrode to the diameter of the opening of fourth electrode satisfy the following equations: 54A-5B+4.ltoreq.0, 55A-5B+7.gtoreq.0, A-0.18.gtoreq.0, and 95A+10B-73.gtoreq.0.

Abstract: An image pick-up tube and a method of fabricating an image pick-up tube and a target section used therewith, in which the target includes at least a conductive film and a photoconductive film on a substrate for photo-electric conversion, and a signal from the target section is read by an electron beam scanning system. At least a part of the surface area outside the effective scanning region of the electron beam scanning side of the target section is formed of a secondary electron emission dampening layer.

Abstract: In an electromagnetic focusing electrostatic type image pick-up tube the electrostatic deflecting electrodes formed on the inner surface of the tube consist of 2 pairs of electrodes. Each of these electrostatic deflecting electrodes has a zig-zag shape from the electron gun towards the target. This zig-zag shape is twisted in the circumferential direction around the axis of the tube and variation rates of this twist amount are different, depending on the position in the axial direction.

Abstract: A television camera tube comprising in an evacuated envelope, an electron gun for generating at least one electron beam. The electron beam is focused onto a target, and is deflected over the target. A grid electrode having hexagonal apertures is provided in front of the target.The apertures in the grid electrode are arranged in a honeycomb structure. Each aperture has the form of an equilateral hexagon having angles of 120.degree.. As a result, the susceptibility to Moire effects is reduced, the microphonic properties are improved, and the mesh obtained has a high transmissivity while it can more readily be tensioned and is easier to handle.

Abstract: In an image pickup tube comprising a glass bulb, a face plate, a target surface, a mesh electrode arranged in opposition to the target surface, and a mesh holder to support the mesh electrode, the mesh electrode having supported with non-uniform tension at various portions thereof by the mesh holder whereby microphonic noise is attenuated rapidly.

Abstract: A pickup tube includes a generally cylindrical envelope having an input window at one end of the envelope and a radiation sensitive target adjacent to the input window. An electron gun is mounted in the other end of the envelope for generating an electron beam which is incident on the target. A mesh assembly is spaced from the target and in proximity therewith. The mesh assembly comprises a mesh electrode disposed between a mesh support ring and a novel mesh retaining ring. The novel mesh retaining ring has a mesh contact portion and a peripheral skirt portion which is disposed substantially orthogonally to the mesh contact portion. The skirt portion is directed toward the target for modifying the electrostatic field between the mesh electrode and the target so as to reduce beam landing error on the target and to prevent electrons, which are reflected from the target, from landing on the mesh retaining ring.

Abstract: A magnetic focus and electrostatic deflection type image pick-up tube in which electrostatic deflection electrodes assuming a cylindrical shape as a whole are twisted about the axis of the cylinder at an angle selected so as to range from 21.degree. to 60.degree.. The spot of the electron beam is less enlarged in an oval shape at the corners of target in the imaging tube.

Abstract: A cathode ray tube comprises an envelope, an electron beam source positioned at one end of the envelope, a target positioned at another end of the envelope, and an electrostatic lens means positioned between the electron beam source and the target. The lens means has a first cylindrical electrode and a second cylindrical electrode positioned along the electron beam path to focus the electron beam. The second cylindrical electrode is divided into four patterned electrodes, and each of the deflection electrodes has a lead which is formed across the first cylindrical electrode but is isolated therefrom. The portion of the leads is positioned to cause a predeflection to the electron beam.

Abstract: An image pick-up tube has a photoelectric conversion target including a transparent substrate, and a transparent electrode and a photoconductive layer formed on the transparent substrate. An electron beam is scanned on the photoelectric conversion target. A first electrode is formed on a beam scanning surface of the photoconductive layer so as to be segmented in stripe or grid with its electrode segments electrically connected to each other. A second electrode is formed on the first electrode through an insulating layer with its electrode segments electrically connected to each other. An insulating layer may be interposed between the first electrode and the photoconductive layer.

Abstract: Television camera tube comprising a tubular envelope of glass drawn on a mandril and having an internal conductive wall coating. A diaphragm having an aperture is supported in the envelope by a supporting surface extending transverse to the longitudinal axis of the envelope. The supporting surface is formed by a substantially stepwise change in the internal transverse dimension of the envelope. The conductive wall coating is interrupted at a distance from the diaphragm. The stepwise change in the internal transverse dimension of the envelope portion taking place in at least a first a step and second step. The first step forms the supporting surface for the diaphragm. The interruption (6) in the conductive wall coating is provided on the second step. If the diaphragm in such a tube is a flat plate and the distance d between the first step and the second step is between 0.4 D and D, where D is the inside diameter of the envelope between the first and the second step, the axial astigmatism.

Abstract: A semiconductor cathode is provided with deflection electrodes, with which a dipole field can be generated. As a result of this, electrons released at the surface of the semiconductor cathode leave the surface at a certain angle. For use inter alia in camera tubes, display tubes, such an inclined beam can be aligned without any problems. Positive ions which are released inter alia from residual gases and are accelerated in the direction of the cathode impinge on the cathode at an acute angle. As a result of this, the active part of the cathode is substantially not attacked by said positive ions, so that degradation is prevented.

Abstract: An image pickup tube comprising a target composed of a light-transmissible plate, a transparent electrode provided on said light-transmissible plate and a photoconductor made of hydrogen-containing amorphous silicon provided on said transparent electrode; an electron beam generator; and a mesh electrode near the aforesaid target, at least the surface of said mesh electrode being made of at least one member selected from the group consisting of Be, B, C, Mg, Al and Si, has high resolution with greatly improved life characteristics.

Abstract: An image pickup tube of high velocity electron beam scanning and negatively charging system having a target including, on a transparent substrate, at least a transparent conductive film, a photoconductive layer, a layer for emitting secondary electrons, and stripe electrodes. The transparent substrate may be made of amorphous silicon.

Abstract: A television pick-up tube includes a mesh assembly comprising a pair of superimposed support members having mutually adjacent support surfaces with a mesh electrode secured therebetween. Each of the support members has a centrally disposed aperture therethrough. The apertures are of a different size so that a portion of the support surface of one of the support members extends radially inwardly of the aperture in the other support member. The radially inwardly extending portion of the support surface has a fusion-resistant film of material thereon to prevent the mesh electrode from sticking thereto during the mesh assembly procedure. A method for forming the fusion-resistant film is also disclosed.

Abstract: A television camera tube with electrostatic focusing comprising a triode section at the first stage having a cathode a first grid and a second grid, an electrostatic focusing lens section at the next stage having a third, fourth and fifth grids of cylindrical electrode configuration, and a sixth grid with mesh electrode configuration at the last stage, these electrodes being coaxially arranged in a cylindrical glass envelope, the length of the fourth grid is greater than 1.15 times the inner diameter thereof but equal to or smaller than 2.30 times the inner diameter thereof.

Abstract: The optical cross talk in a camera tube is reduced by the provision of a filter element which overlaps the entire target. The filter may is be arranged behind the target and is constructed so that it has low reflectance for incoming light. In order to prevent excessive transverse conduction, such a filter has a mosaic structure consisting of mutually insulated areas.

Abstract: A pick-up tube includes a generally cylindrical envelope having a faceplate at one end thereof and a cathode in the other end. A photoconductive target electrode is adjacent to the faceplate and a mesh assembly is disposed in spaced relation adjacent to the target electrode, between the target electrode and the cathode. The mesh assembly comprises a mesh electrode disposed between a frusto-conically shaped mesh support ring and a bow-shaped mesh damping ring. The mesh damping ring is fixedly attached at a plurality of points around its outer periphery to the mesh electrode and the mesh support ring. The inner periphery of the mesh damping ring is formed into a plurality of arcuately shaped regions extending therearound. Each of the arcuately shaped regions is interconnected by a portion of the damping ring which is in contact with the mesh electrode.

Abstract: A method of manufacturing a target of an image pickup tube comprising the steps of: forming a plurality of groups of transparent conductive signal electrodes on a transparent insulating base plate; forming a first layer on at least a portion constituting an image area of the image pickup tube, said first layer being substantially insoluble in etching liquid used for etching an insulating layer to constitute an intermediate layer insulator in a double layered interconnection structure; forming, after formation of said first layer, an insulating layer to constitute said intermediate-layer insulator; removing a predetermined portion of said insulating layer, removing said first layer together with said insulating layer located thereon; forming bus bars; and forming a photoconductive layer on said plurality of groups of the transparent conductive signal electrodes.This invention provides an excellent method for mass production.

Abstract: The structure of an electrode for collimation lens in an image pickup tube has an improved joint for an accelerating electrode of an electron gun and a mesh electrode. The joint has an electrode support member integral with the fore end of the accelerating electrode and having a cylindrical center portion width not overlapped with the fore end, and a glass bead for connecting the width and the mesh electrode.

Abstract: A pick-up tube includes a generally cylindrical envelope having a faceplate at one end thereof and a cathode in the other end. A photoconductive target electrode is adjacent to the faceplate and a mesh assembly is disposed in spaced relation adjacent to the target electrode, between the target electrode and the cathode. The mesh assembly comprises a mesh electrode disposed between a frustro-conically shaped mesh support ring and a dished, spring-like mesh damping ring. The mesh damping ring is fixedly attached at a plurality of points around its periphery to the mesh electrode and the mesh support ring. The mesh damping ring is compressed into a reversal of its dished shape and assumes an undulatory configuration contacting the mesh electrode periodically around the inner periphery of the damping ring thereby retaining the mesh electrode with reduced microphonics.

Abstract: In a cathode-ray tube, in particular a camera tube, the inner wall of the glass envelope is coated with an electrically conductive material interrupted in the proximity of electrodes extending transversely to the wall coating and supported by transversely extending supporting surfaces. At the area of each of the interruptions the envelope has a stepwise decrease of the inside diameter in two steps. In the direction of decreasing diameter the first of these steps constitutes the supporting surface for the transverse electrode and the interruption in the wall coating is provided on a wall portion of the second of these steps. The interruptions provided in this manner do not exert any disturbing influence on the electron beam in the tube.

Abstract: A pickup tube such as a vidicon has an improved structure for precisely aligning a mesh support electrode relative to a focus electrode. The structure comprises a plurality of focus electrode embossments extending radially outward from the focus electrode and a plurality of mesh support electrode embossments extending radially inward from the mesh support electrode. An insulating ring is molded in situ between the focus electrode embossments and the mesh support electrode embossments. The focus electrode embossments and the mesh support electrode embossments are embedded into the insulating ring.

Abstract: An electron tube, preferably a camera tube, has an improved structure for supporting and centering a cylindrical electrode within a tubular envelope having a precisely formed inner surface. The support structure comprises a centering ring that has a plurality of radial sectors formed to a ring circumference and a plurality of resilient radial finger-like members formed intermittent the radial sectors. The ring circumference is formed within a close spacing of the inner surface of the envelope and is attached to the electrode so that the ring circumference is substantially concentric with the outer surface of the electrode. The finger-like members of the ring are formed to define an outer diameter that is greater than the inner diameter of the envelope, so that when the electrode with the attached ring is inserted into the envelope, the members flexibly bear against the inner envelope surface and guide the ring into position without deforming the radial sectors.

Abstract: If in a television camera tube the gauze-shaped electrode which is tensioned before the signal plate is assembled in a damped mass-spring system, in which the ratio of the mass of said system to the mass of the gauze should be larger than 30, while the fundamental frequency of the gauze and the natural frequency of the mass system differ less than 10% from each other and the damping of the mass spring system is so large that the time necessary for a decrease in amplitude of 20 db of the vibration of the mass of the mass spring system is smaller than 0.5 second, a tube is obtained having a low microphony.

Abstract: A thin target wafer of silicon includes a light receiving surface which is mounted to an inner faceplate surface of a pickup tube envelope by an interposed region of transparent adhesive. The peripheral edge of the adhesive is sealed by a conductive sealant material to substantially prevent outgassing of the adhesive within the interior of the envelope. In one embodiment, a conductive sealant material is provided by which electrical contact from the wafer to an electrical connector, extending external to the envelope, is established.A method of assembly of the wafer with the faceplate is provided wherein residual bubbles of the interposed flowable adhesive are substantially collapsed by assembly of the wafer and the faceplate in a vacuum, and, thereafter, exposing the wafer-faceplate assembly to atmospheric pressure.

Abstract: A separate mesh vidicon in which in order to reduce voltage pick-up from the scanning field by the conductor system which makes connection to the mesh and at the same time provide a tube which is relatively insensitive to rotation about its axis when positioned within its scanning yoke, connection to the mesh is made within the area occupied in operation, by the scanning field, by a cylindrical conductor surrounding the usually provided cylindrical anode, the remainder of the connection path being provided by a number of conductors arranged symmetrically about the axis of the tube, and an external removable link is provided bridging between the mesh terminal pin and the anode terminal so that the tube may be operated at will as a separate or integral mesh tube.

Abstract: A television camera tube in which the electrode which is positioned in front of the photosensitive layer is connected to the envelope by means of lug-shaped springs. To avoid microphonic interferences, the lug-shaped springs engage the wall of the envelope at the area of a bend in the spring so that a lever is formed.

Abstract: An electrode structure includes a pin that extends through a hole in a fragile substrate, such as a thin, glass plate, and makes contact with a conductive layer on one surface of the plate. The structure includes a first metallic adherent layer on that portion of the conductive layer and a second metal layer on the exposed surface of the first metal layer. The hole extends through the conductive layer and both of the metal layers. The first metal layer is adherent to the conductive layer and consists of iron, chromium, or nickel, for example, deposited on the conductive layer. The second metal layer is a fixative for the first layer and is wettable by soft solder. It consists of a noble metal from the group consisting of gold, silver, platinum and paladium. The pin has a head larger than the cross-section of the hole and a surface that is wettable by soft solder.

Abstract: A television camera tube having a conductive gauze behind the target plate, the parallel wires of which cross each other at an acute angle which has been suitably chosen to minimize interference in decoded colour signals.

Abstract: A target assembly of an image pick-up tube including a face plate hermetically fastened on one open end of a tubular envelope of the image pick-up tube through pressure welded binding member composed of indium which is interposed therebetween. A support member supporting therein a target substrate is mounted on the inner surface of the face plate and secured thereto through its peripheral wall combined with the binding member. On the peripheral wall is formed a groove extending circumferentially thereof. The binding member combines with the groove so that the support member favorably fastened to the face plate.