U.S. Philips Corporation

Other

Bredel Exploitatie B.v.

Jan Gerritsen

Piet G Barten

Jan Bijma

Otto Mensies

Joris A Nieuwendijk

Willem M Van Alphen

Antonius H Peels

Constantius Johannes Panis

Jan Hendrik Duistermaat

Antonius J Van Den Beld

Adrianus Hubertus Kantelberg

Johannes Van Den Boogert

Kees Tendeloo

Joannes C Aerts

The invention relates to a mortar transport apparatus, consisting essentially of a rotor comprising cylindrical mortar transport chambers, the rotor being arranged between stationary sealing plates and being adapted to be driven by a motor, a feed hopper arranged above the rotor, the feed hopper being adapted to fill the mortar transport chambers via a filling hole provided in the sealing plate situated above the rotor, a blow-off chamber arranged under the lower sealing plate and adapted to have a transport hose connected to it, the blow-off chamber being adapted to be filled via a mortar discharge opening in the lower sealing plate, a duct for supplying air under pressure terminating in a slit-shaped opening in the upper sealing plate above the mortar transport chamber which communicates with the blow-off chamber for driving out the mortar present in the transport chamber, air being supplied to the blow-off chamber at the location opposite the transport hose connection, for pneumatic transport of the mortar through the transport hose. According to the invention the slit-shaped opening (16) is formed by a series of separate spray openings (31) arranged side by side, and arranged for an adjustable water/air mixture to be supplied to them under pressure. The series of spray openings are arranged in a semi-circular pattern (16), the radius of the pattern being about equal to the radius of the transport chamber (10).

Mortar transport apparatus

A cathode ray tube, such as a blue luminescing projection television display tube including, in an evacuated envelope (1), an electron gun (5) for generating an electron beam (6) which is focused to a spot (8) on a display screen (7) by means of an electrostatic focusing lens (27, 30) and which is deflected across this display screen (7) in two mutually perpendicular directions (x, y). A structure (37) magnetized as a four-pole and consisting of a magnetic half-hard material is provided at the area of a focusing lens formed by two electrodes (27, 30) and coaxially around the gun axis (20), the axes of the four-pole being located centrally between the deflection directions. The structure (37) extends the spot in the vertical direction so that phosphor saturation, particularly in blue projection tubes is reduced.

Cathode ray tube including means for vertically extending the spot

In a color display tube including an electron gun system for producing three electron beams situated with their axes in one plane, coincides to the said plane, curved field shapers 27, 28 are provided at the end of the system. Each field shaper comprises at least three plates of ferromagnetic material. The plates are situated symmetrically with resepect to the plane and the central beam axis, and the curved field shapers face the three beams with their concave sides. The field shapers make the edge field of the frame deflection field pin-cushion-shaped. Each field shaper comprises at least two circumferentially-spaced plates and slots 35, 36 between the plates are covered by plates 31, 34, so that at least one magnetic shunt is formed in each field shaper. The line deflection field is attenuated less and a field disturbance at the area of the electron beams is prevented.

Color display tube

Color display tube comprising an electron gun 5 of the in-line type. The electron gun 5 comprises a main lens which is constituted by a first focussing electrode 25 and a second focussing electrode 26. The first focussing electrode comprises sub-electrodes 27, 28 placed at a distance from each other between which an auxiliary electrode constituting an astigmatic element G.sub.AST is positioned. The auxiliary electrode G.sub.AST is connected during operation to means for applying a constant voltage, whilst at least the sub-electrode 28 forming part of the main lens is connected during operation to means for applying a control voltage. The control voltage may be a static voltage or a dynamically varying voltage, for example, a parabolic voltage which is in synchronism with the line deflection.

Color display tube with reduced deflection defocussing

A display tube comprising an evacuated envelope having a display window, a conical portion and a neck, and an electron gun in the neck for generating an electron beam which is focused to form a spot on a display screen on the display window, the electron beam being deflected over the display screen in mutually perpendicular directions by pin-cushion-shaped deflection fields produced by a system of deflection coils. Field shapers are provided at the gun end of the tube which comprise two mutually perpendicular pairs of flat plates of ferromagnetic sheet material, the respective pairs of plates being arranged coaxially around the electron beam and respectively extending in the respective deflection directions. The plates are supported so that the gun ends thereof are at substantially the same distance from the electron gun, and cause the edge fields of the deflection fields to be barrel-shaped so as to prevent defocusing of the beam by the pin-cushion deflection fields.

Display tube having ferromagnetic field shapers to prevent beam

A cathode-ray tube comprising in an evacuated envelope an electron gun for generating at least one electron beam which is focused on a display screen to form a spot and which is deflected in two mutually perpendicular directions so that a raster is written on the display screen. The electron gun comprises a cathode which is centered on an axis, a first grid at some distance therefrom along the axis and a second grid at some distance from the first grid, the first and second grids each having a part which is perpendicular to the axis and which comprises an aperture around the axis. The aperture in the first grid, on the side of the second grid, is elongate in a direction coinciding with one of the deflection directions and, on the side of the cathode, is elongate in a direction perpendicular to the elongate direction of the aperture on the side of the second grid. The dimensions and the depths of the portions of the aperture on the side of the second grid and on the side of the cathode are chosen so that, for the beam operating current range of the cathode-ray tube, substantially one cross-over is formed in an astigmatically-focused electron beam, thereby improving near the second grid, spot quality.

Cathode-ray tube having an electron gun with an astigmatic focusing grid

In a color display tube having an electron gun of the 'in-line' type for generating three electron beams situated with their axes in one plane, the electron gun includes curved field shapers at the end from which the beams exit into frame and line deflection fields. Each field shaper includes two or more plates of ferromagnetic material aligned along a curve and spaced from each other by slots. The plates are arranged symmetrically with respect to the plane and the central beam axis, and a concave side of each field shaper faces the three beam axes. At least the ends of each field shaper which are most remote from the plane have substantially flat plates extending in the direction of the central electron beam axis. By using such field shapers the losses in the line deflection field are small and substantially undistorted, while a desirable pincushion-shaped distortion of the frame deflection field is intensified.

Color display tube with magnetic field shaping means

The spot quality of an electron beam produced by an electron gun in a cathode ray tube is improved by optimizing the dimensions of a beam-forming, apertured electrode arrangement in the gun. This arrangement includes electrodes for forming a cross-over followed by, in the direction of propagation of the electron beam, first and second lens electrodes centered around an axis, for defining an accelerating and prefocusing lens and at least two lens electrodes for defining a main focusing lens. The diameter of the aperture in the second lens electrode is smaller than twice the diameter of the aperture in the first lens electrode, and the effective spacing S-eff between the first and the second lens electrodes is smaller than 1 mm. S-eff is defined as the minimum of the function ##EQU1## where .DELTA.V is the operating voltage difference between the second and first lens electrodes and

Cathode-ray tube

A picture display device including a picture display tube and a circuit for supplying the heater thereof with an increased heater voltage during a predetermined warming up period. The heater is connected to the secondary winding of an (auto) transformer, the primary winding of which is connected to a terminal of an a.c. voltage source, for example a winding provided on a line output transformer, the other ends of the primary and the secondary windings being interconnected and connected to a positive temperature coefficient thermistor and the other ends of the heater and the thermistor being connected to the other terminal of the source. The secondary winding has more turns than the primary winding.

Picture display device comprising a picture display tube and a circuit

A device for and methods of measuring and adjusting the convergence of the electron beams in a color display tube of the shadow mask type. The device includes a detector in the form of a divided photosensitive cell comprising at least two separate photosensitive surface parts which are situated symmetrically relative to the center of the cell. The photosensitivity of the surface parts increases substantially from the center of the cell. In use the device is mounted so that the detector is on the central area of the display screen. Three lines are produced in one deflection direction of the tube by means of the three electron beams with one video signal. The central line and detector are moved relative to each other until the longitudinal axis of the line coincides with the center of the cell. Then either the distances from the axes of the other two lines to the axis of the center line are measured by determining the differences of the incident light impinging on the two separate surface parts and the measurements are stored for subsequent use or the static convergence unit of the tube is adjusted until all three lines coincide. The method is repeated for three lines extending in the other deflection direction.

Device for measuring and methods for adjusting the convergence of the

If in a device for displaying colored pictures comprising a color display tube of the 'in-line' type, which comprises magnetized means for maintaining a static magnetic multipole magnetic field near the output of the electron gun system for carrying out static beam corrections, a correction magnet is provided outside the neck near the output of the electron gun system and near at least one outermost electron beam, which magnet forms a magnetic dipole and is intersected by the said plane and which correction magnet is small with respect to its distance to said electron beam, it is possible afterwards to provide small corrections in the horizontal static convergence.

Color display tube including cylindrical dipole correction magnets

A color television display device comprising a deflection coil unit with a deflection coil for the vertical deflection which coil is divided into two coil halves. A balancing resistor by means of which the convergence can be corrected is in a parallel branch. A static convergence error introduced by this resistor owing to the non-zero inductance of the deflection coil is corrected by means for decreasing the voltage present across the balancing resistor during the trace period of the deflection current by a direct voltage in such a way that the voltage across the resistor is more decreased after the center instant of the trace period than before and that the correction current at and about said center instant is substantially zero. (FIG. 3).

Color television display device comprising a deflection coil unit

A ring is provided to correct the convergence, color purity and frame errors of a color display tube which ring is magnetized as a multipole and which is secured in or around the tube neck and around the paths of the electron beams. The magnetization of such a ring can best be carried out by energizing a magnetization unit with a combination of direct currents thereby generating a multipole magnetic field and then effecting the magnetization by generating a decaying alternating magnetic field which preferably varies its direction continuously.

Method of manufacturing a color display tube and color display tube

A peristaltic type pump comprising a pump housing having a circular supporting track for a pump hose and a member mounted rotatably within the pump housing. The member has at two diametrically opposite points, seen in radial direction, dimensions that are substantially equal to the internal radius of the supporting track reduced by the thickness of the pump hose in squeezed shut condition. The rotatable pumping member has a substantially elliptical shape, while the pump hose can be squeezed shut by flattened portions of the pumping member which are substantially perpendicular to the ends of the major axis of said ellipse. The lengths of said portions in tangential direction is substantially equal to the internal diameter of the pump hose, while said flattened portions are adapted for sliding movement over the pump hose when the pumping member is rotating.

Peristaltic type pump

A peristaltic pump, in particular for pumping concrete, cement, and other mixtures containing liquid. The pump has a hose having layers of helically wound reinforcing threads embedded in the wall thereof. The angle of pitch of the windings in one layer is opposite to that in the other layer. The hose is fastened at the delivery end, and the angle of crossing, opening in the longitudinal direction of the hose, between the windings in the different layers is larger than the equilibrium angle.

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Eindhoven, Netherlands

Jan Gerritsen