Abstract: The present invention is to provide an electron microscope capable of being activated to an appropriate temperature by disposing an NEG at an extraction electrode around an electron source. The present invention is an electron microscope provided with an electron gun, in which the electron gun includes an electron source, an extraction electrode, and an accelerating tube, the accelerating tube is connected to the extraction electrode at a connection portion, the extraction electrode includes a first heater and a first NEG, and the first heater and the first NEG are spaced apart in an axial direction of an electron beam emitted from the electron source.

Abstract: The present invention relates to electronic technology field, and more particularly to CRT and projection system. A low power laser CRT based on parallel flow electron gun comprises a vacuum tube, a laser panel provided at one end of the vacuum tube and an electron gun provided at the opposing end. The electron gun adopts a parallel flow electron gun, wherein the parallel flow electron gun comprises a negative electrode, a G1 electrode and a control electrode, wherein the control electrode is connected to an electron beam current control system. The electron gun of the present invention adopts parallel flow electron gun to emit electron beam, so that the laser panel has even current density distribution so as to average the power consumption of laser panel to reduce the energy that is converted to heat.

Abstract: In an accelerating tube which uses a conductive insulator, there is a possibility that the dopant concentration on a surface of the conductive insulator becomes non-uniform so that the surface resistance of the conductive insulator becomes non-uniform. Accordingly, a circumferential groove is formed on the inner surface of the conductive insulator accelerating tube in plural stages, and metal is metalized along inner portions of the grooves. When the resistance of a specific portion on the surface of the accelerating tube differs from the resistance of an area around the specific portion, the potential of the metalized region on the inner surface of the accelerating tube becomes a fixed value and hence, the potential distribution on the inner surface of the accelerating tube in the vertical direction can be maintained substantially equal without regard to the circumferential direction.

Abstract: The present invention has an object to provide a cold cathode field-emission electron gun with low aberration, to thereby provide a high-brightness electron gun even in the case of a large current. The present invention provides a field-emission electron gun which extracts an electron beam from a cathode and converges the extracted electron beam, the field-emission electron gun including: a magnetic field lens which is provided such that the cathode is disposed inside of a magnetic field of the lens; and an extraction electrode for extracting electrons from the cathode, the extraction electrode being formed into a cylindrical shape without an aperture structure. The present invention can provide an electron gun having a function of converging an electron beam using a magnetic field, the electron gun which is capable of reducing an incidental electrostatic lens action and has small aberration and high brightness.

Abstract: A discharge lamp lighting device includes: a discharge lamp driving unit that supplies an AC driving current to a discharge lamp to drive the discharge lamp; a current detecting unit that detects the AC driving current supplied to the discharge lamp; and a control unit that controls the discharge lamp driving unit, wherein the control unit controls the discharge lamp driving unit after a predetermined time from the start of lighting driving operation of the discharge lamp on the basis of the behavior of the AC driving current detected by the current detecting unit at the predetermined time from the start of lighting driving operation of the discharge lamp.

Abstract: An electron beam source includes a base and a tip fixed to the base and extending from the base. The tip includes a core and a coating applied to the core. The core has a surface that includes a first material. The coating includes a second material which is different from the first material. The second material forms a surface of the tip, and the second coating includes more than 30% by weight of a lanthanide element.

Abstract: An apparatus and method for generating femtosecond electron beam are disclosed. The apparatus for generating electron beam by discharging an electron generated via a cathode to an anode includes a transmission window provided at one side of the cathode to allow incident laser to pass therethrough, a pinhole formed on the anode such that the pinhole corresponds to the position of the electron generated from the transmission window, and a focusing unit provided at one side of the cathode and generating an electric field to accelerate and at the same time concentrate the electron to the pinhole. Electrons are simultaneously concentrated and accelerated to the pinhole by an electric field generated by the focusing unit positioned at the cathode to generate femtosecond electron beam.

Abstract: [Object] In the control of electron beam focusing of a pierce-type electron gun, any influences from the space charge effect and space charge neutralizing action within the electron gun are eliminated to attain complete control of an electron beam. [Solving Means] Feedback control of the pressure within the electron gun is performed by directly measuring temperature at an internal of the pierce-type electron gun. It is desirable that locations where the direct measurement of the temperature at the internal of the electron gun is performed are an anode (39) and a flow register (43). Further, the direct measurement can be performed at any one of a ring, an aperture and an exhaust pipe provided at an outlet or an inlet of any one of a cathode chamber (31), an intermediate chamber, and a scanning chamber (33).

Abstract: An apparatus and method for generating femtosecond electron beam are disclosed. The apparatus for generating electron beam by discharging an electron generated via a cathode to an anode includes a transmission window provided at one side of the cathode to allow incident laser to pass therethrough, a pinhole formed on the anode such that the pinhole corresponds to the position of the electron generated from the transmission window, and a focusing unit provided at one side of the cathode and generating an electric field to accelerate and at the same time concentrate the electron to the pinhole. Electrons are simultaneously concentrated and accelerated to the pinhole by an electric field generated by the focusing unit positioned at the cathode to generate femtosecond electron beam.

Abstract: A three-dimensional structure forming a space in which a wiring-side portion of a device electrode is located is arranged on a rear plate. A surface potential of the three-dimensional structure is defined so that an electric field intensity of the space becomes weaker than an average electric field intensity expressed below, average electric field intensity=Va/d, where Va is application voltage of an anode electrode, and d is an interval between a rear plate and the face plate. The device electrode includes a high-temperature portion where temperature locally rises when current flows through the device electrode. The high-temperature portion is positioned in the space or at a distance of less than or equal to 20 ?m from the space.

Abstract: [Object] In the control of electron beam focusing of a pierce-type electron gun, any influences from the space charge effect and space charge neutralizing action within the electron gun are eliminated to attain complete control of an electron beam. [Solving Means] Feedback control of the pressure within the electron gun is performed by directly measuring temperature at an internal of the pierce-type electron gun. It is desirable that locations where the direct measurement of the temperature at the internal of the electron gun is performed are an anode (39) and a flow register (43). Further, the direct measurement can be performed at any one of a ring, an aperture and an exhaust pipe provided at an outlet or an inlet of any one of a cathode chamber (31), an intermediate chamber, and a scanning chamber (33).

Abstract: To provide an electron source to be used for a surface analyzer such as a scanning or transmission electron microscope or an Auger electron spectroscope, or an electron beam lithography machine, particularly for a semiconductor wafer inspection apparatus such as a scanning electron microscope to be used at a low acceleration with an electron beam acceleration voltage of up to 1 kV, CD SEM or DR SEM. An electron source wherein a barium supplying source consisting of a complex oxide comprising barium oxide and an oxide of metal other than barium, is provided at a portion of a single crystal needle of tungsten or molybdenum.

Abstract: An electron gun comprises a shell having distal and proximal ends, a cathode structure disposed within the shell and having an electron emitting surface, an anode physically coupled to the shell at the distal end and spaced a fixed distance from the emitting surface, and a plurality of leads adapted to apply a voltage to the cathode structure with respect to the anode sufficient to cause emission of the electrons from the emitting surface. The anode has an aperture for passage therethrough of the beam of electrons emitted by the emitting surface. A first insulator is disposed within the shell proximal to the cathode structure. The first insulator has plural apertures having respective sizes in relation to corresponding ones of the plurality of leads such that the plurality of leads pass therethrough without contacting the first insulator. The first insulator provides stand-off for the voltage between the anode and cathode. A second insulator is disposed with the shell proximal from the first insulator.

Abstract: An electron-emitting device, comprising: a pair of device electrodes formed on an insulating substrate; and a conductive film formed to connect the device electrodes and having an electron-emitting portion, wherein the conductive film has a thickness of 3 nm to 50 nm and is made of precious metal and oxide of base metal, a percentage of the base metal among metals contained in the conductive film is 30 mol % or more, and the conductive film has a concentration gradient of the oxide of the base metal in a thickness direction.

Abstract: An electron emitting element having a cap portion 103 with a closed structure and a columnar axis portion 101a comprising a tubular material composed mostly of carbon and a conductive base material for immobilizing the tubular material, characterized in that; the cap portion 103 includes a plurality of five-membered ring structures 104 made by atoms which constitute the tubular material and the distance between the five-membered ring structures 104 is 30 nm or more.

Abstract: An electron gun includes a cathode adapted to emit thermal electrons, a first electrode and a second electrode adapted to form a triode portion together with the cathode, a plurality of focusing electrodes, each of said plurality of focusing electrodes being perforated by a plurality of beam passage apertures and an anode electrode, wherein a pitch between ones of said plurality of beam passage apertures of a one of said plurality of focusing electrodes arranged closest to the second electrode is smaller than a pitch between ones of said plurality of the beam passage apertures of a remaining of said plurality of focusing electrodes.

Abstract: Cathode structure for cathode ray tube comprising an eyelet in two separate parts positioned such that one of the parts covers, in the longitudinal direction and at least partially, the second part. The two parts are linked to each other at the shouldered ends. This structure reduces the heat losses of the cathode and reduces its consumption while it is operating.

Abstract: The CRT (10) according to the invention has an envelop (11) including a panel (12) attached to a funnel (15), the funnel having a neck (14) and an electron gun (26) for generating at least one electron beam (28) contained in the neck. A mask (25) is contained in the envelop near the panel. A region of the mask has columns (30) of apertures (31) of predetermined heights and predetermined pitches. The at least one electron beam has a spot size range and spot shape selected such that the moiré transformation function for the CRT in the region is less than about 0.02, wherein the moiré transformation function is a quotient having a numerator being the difference between a maximum value and a minimum value of mask transmission and a denominator being the sum of the maximum and the minimum values.

Abstract: A CRT includes an electron gun that includes a cathode adapted to emit thermal electrons, a first electrode and a second electrode adapted to form a triode portion together with the cathode, a plurality of focusing electrodes, an anode electrode and a subsidiary electrode arranged between the second electrode and a one of said plurality of focusing electrode adjacent to the second electrode. The subsidiary electrode is adapted to dynamically control an imaginary crossover point ofelectron beams emanating from the electron gun corresponding to landing locations ofthe electron beams on a phosphor screen of a panel in response to a voltage applied thereto.

Abstract: A cathode ray tube has an electron gun oriented along an axis (Z), comprising a quadrupolar device which comprises three electrodes (5, 6, 7). Each electrode possesses a central aperture, a right lateral aperture and a left lateral aperture all three substantially rectangular. The centers (c5.1, c7.1) of the central apertures of the three electrodes are aligned along the axis (Z) of the gun. The centers (c6.1, c6.3) of the left and right lateral apertures of the second electrode (6) are situated along respectively a first axis (z1) and a second axis (z3) that are parallel to the axis (Z) of the gun. The centers (c5.1, c7.1) of the left and right lateral apertures (5.1, 5.3, 7.1, 7.3) of the first and/or of the third electrode (5,7) are offset with respect to the axes (z1, z3) passing through the centers of the apertures of the second electrode. Such an arrangement makes it possible to correct the MODEC defects.

Abstract: An electron beam pumped laser including a surface-emitting laser faceplate oriented at a non-perpendicular angle. Embodiments are described in which a bending coil bends the electron beam, or in which the faceplate is situated in the direct path of the e-beam emission but with a non-zero orientation angle. The faceplate may include a substantially opaque substrate, and an opaque heat-removing structure may be attached to the substrate to provide high heat transfer, thereby allowing high electron-beam pumping intensity and providing more light emission from a smaller package. In some embodiments the partially reflective mirror comprises a metal layer that has a plurality of openings. Multiple laser faceplates (e.g., red, green, and blue) may be placed in the same tube, to provide a continuous light source for projection television. The substrate may be connected to ground to provide an exit path for electrons from the laser gain layer.

Abstract: A deflection device includes a first magnetic field generator, which generates a magnetic field of the same polarity as that of a vertical deflection magnetic field during upward deflection, on an upper side from an XZ-plane, a second magnetic field generator, which generates a magnetic field of the same polarity as that of a vertical deflection magnetic field during downward deflection, on a lower side from the XZ-plane, a third magnetic field generator, which generates a magnetic field of a polarity opposite to that of the vertical deflection magnetic field during upward deflection, on the upper side from the XZ-plane, and a fourth magnetic field generator, which generates a magnetic field of a polarity opposite to that of the vertical deflection magnetic field during downward deflection, on the lower side from the XZ-plane.

Abstract: A cathode-ray tube device including a deflection yoke for deflecting an electron beam emitted from an electron gun in horizontal and vertical directions. The deflection yoke has a vertical deflection coil that deflects the electron beam vertically. The vertical deflection coil is wound toroidally around a bell-shaped ferrite core, and on the electron gun side of the ferrite core, a square “U” shaped magnetic body that is doubled back partway along in a longitudinal direction is disposed on the horizontal axis, so that the ends thereof extend towards and are separated along the tube axis.

Abstract: A cathode ray tube comprises a panel having a fluorescent screen on an inner surface; a funnel connected to the panel, an electron gun housed in the funnel; emitting electron beams; and a shadow mask for selecting colors of the electron beams emitted from the electron gun, wherein the deflection yoke comprises a deflection coil for deflecting the electron beams in horizontal and vertical directions, a holder for insulating the deflection coil, and a ferrite core for reducing a magnetic field generated by the deflection coil, and an opening is formed on a flange portion of an opening section on a screen side of the deflection coil.

Abstract: A permanent magnet is selectively picked for a deflection yoke and provided on the periphery of the cathode ray tube for controlling the direction of an electron beam emitted towards a screen from an electron gun. The permanent magnet can adjust an irradiating point of the electron beam. The permanent magnet incorporates a magnetic substance that can be applied to at least one of the end faces of the magnet with a negative temperature characteristic. The magnetic substances can have different configurations and based on the saturation flux density of the permanent magnet, can be selected to match the permanent magnet to correct variation in the saturation flux density.

Abstract: An electron gun for a cathode ray tube is disclosed, which has a simple structure and can prevent the spot on a screen from being degraded. In the electron gun for a cathode ray tube including a cathode that emits electron beams, a first electrode that controls the electron beams emitted from the cathode, a second electrode that accelerates the electron beams emitted from the first electrode, and third to fifth electrodes sequentially arranged in a screen direction to act as pre-focus lenses, the electron gun is characterized in that the third to fifth electrodes have different sized electron beam through holes.

Abstract: On an outer circumferential surface of a neck portion of a funnel, a CPU having a pair of quadrupole magnets and a pair of bar-shaped magnets each having magnetic poles on both sides in a major axis direction are provided. The pair of bar-shaped magnets sandwich the neck portion substantially in an in-line direction of an in-line type electron gun, and are provided so that identical poles are opposed to each other, between an end plate of an insulating frame of a deflection yoke and the CPU at a distance from the end plate. In the case where a rotational shift of electron beams is caused, electron beams R and B are corrected so as to move upward and downward (or downward and upward) respectively by a quadrupole magnetic field generated by the quadrupole magnets. Then, the electron beams R and B are corrected so as to move downward and upward (or upward and downward) respectively by the quadrupole magnetic field generated by the pair of bar-shaped magnets.

Abstract: A color picture tube apparatus having an inline electron gun that allows technology for applying a dynamic voltage to an OLF lens to be implemented, while avoiding design difficulties. Eave-shaped electrode plates are attached, parallel with each other in a horizontal scan direction, to a field-correction electrode plate, which is a horizontally long, flatten plate in which three holes are provided, and whose shape is similar to that of an aperture in a circumferential electrode. This structure allows quadrupole lenses to be formed as auxiliary lenses having strong focusing action horizontally and divergent action vertically, and thus an HV differential can be increased. As a result, it is possible to reduce the dynamic voltage without any of the design difficulties accompanying the prior art, in which eave-shaped electrode plates are not provided.

Abstract: A deflection yoke mounted on a rear portion of a cathode ray tube (CRT) to deflect an electron beam emitted from an electron gun of the CRT includes a coil separator mounted on the CRT, a horizontal deflection coil mounted on an inside of the coil separator, having a first section generating a horizontal deflection magnetic field deflecting the electron in a horizontal direction and having a first radius, having a second section generating a magnetic field to weaken the horizontal deflection magnetic field and having a second radius different from the first radius, a vertical deflection coil mounted on an outside of the coil separator and generating a vertical deflection magnetic field deflecting the electron beam in a vertical direction, and a ferrite core covering a portion of the vertical deflection coil to strengthen the horizontal deflection magnetic field and the vertical deflection magnetic field.

Abstract: A resistor for an electron gun assembly includes an insulating substrate, a plurality of electrode elements provided on the insulating substrate, a resistor element provided on the insulating substrate and having a pattern for obtaining a predetermined resistance value between the electrode elements, an insulating coating layer that covers the resistor element, a plurality of metal terminals that are connected to the associated electrode elements, and a lead-out wire that extends from at least one of the electrode elements and is electrically connected to the resistor element. By extending and connecting the lead-out wire to a desired position on the resistor element, the resistor is made adaptable to various alterations and a desired resistance division ratio can exactly be obtained.

Abstract: A color picture tube device has a funnel glass, a pair of horizontal deflection coils, an insulating frame, and a pair of vertical deflection coils. The pair of horizontal deflection coils are opposed to each other in a vertical direction around the outer surface of the funnel glass, and each have a window at the center. The insulating frame covers the horizontal deflection coils, resembles in shape a part of the funnel glass where the horizontal deflection coils are provided, and has openings in areas corresponding to windows of the horizontal deflection coils. The pair of vertical deflection coils are opposed to each other in a horizontal direction around the outer surface of the insulating frame, without overlapping the openings. A pair of correction coils are provided so as to be each at least partially inserted in a different one of the openings.

Abstract: Cathode comprising a substrate (2) supporting a cathode emissive coating, comprising what is called an emissive central zone (12) and what is called a nonemissive peripheral zone (11); according to the invention: the average density and the emissive zone (12) is greater than that in said nonemissive zone (11), the average thickness in the emissive zone (12) is less than that in the nonemissive zone (11). In this way it is possible to significantly limit the drift in cut-off voltage, while still maintaining good maximum emission performance in DC mode and in pulse mode.

Abstract: A resistor for an electron gun assembly is configured to apply a voltage, which is divided with a predetermined resistance division ratio, to an electrode provided in the electron gun assembly. The resistor includes an insulating substrate, an electrode element provided in association with each of a plurality of terminal portions on the insulating substrate, a resistor element having a pattern for connecting the electrode elements and obtaining a predetermined resistance value, and an insulating coating layer that covers the resistor element. In at least one terminal portion B, the electrode element is disposed spaced apart from the insulating coating layer, and an intermediate resistor element is disposed between the electrode element and the insulating coating layer. The intermediate resistor element has a resistance value that is different from a resistance value of the electrode element.

Abstract: An electron source includes a vacuum chamber within which a vacuum is maintained by a vacuum pump. An insulated receptacle is mounted within the vacuum chamber and has a receptacle mounting flange. The receptacle mounting flange is used to establish a coordinate system having an electron beam axis and a lateral plane, wherein the lateral plane is transverse to the electron beam axis. An adapter is mounted to the receptacle and is adjustable in five degrees of freedom with respect to the coordinate system. A cathode and focus electrode are adjustable in at least four degrees of freedom and are pre-aligned with respect to one another prior to being installed on the adapter. An anode is mounted in the vacuum chamber and is aligned at a predetermined distance from the cathode with respect to the coordinate system.

Abstract: A cathode ray tube includes a display for presenting an image, a deflection device, and an electron gun including electron-generating cathodes for generating electron beams. The CRT includes an electron beams controller for varying the trajectory of at least a first electron beam of the electron beams as a function of the intensity of at least the first electron beam, in order to compensate for changes in the convergence angle between electron beams near the display. The electrom beam controller is arranged between the electron-generating cathodes and the deflection device.

Abstract: This invention provides a multielectron gun which generates a plurality of electron beams having uniform characteristics. A multielectron gun (2) is formed of a plurality of electron guns (2a-2c). The electron gun (2a) has, in addition to an electron source (21a), Wehnelt electrode (22a), and anode electrode (23), a shield electrode (24) between the Wehnelt electrode (22a) and anode electrode (23). The shield electrode reduces field interference among the electron guns.

Abstract: A cathode ray tube comprises a panel having a fluorescent screen on an inner surface; a funnel connected to the panel, an electron gun housed in the funnel; emitting electron beams; and a shadow mask for selecting colors of the electron beams emitted from the electron gun, wherein the deflection yoke comprises a deflection coil for deflecting the electron beams in horizontal and vertical directions, a holder for insulating the deflection coil, and a ferrite core for reducing a magnetic field generated by the deflection coil, and an opening is formed on a flange portion of an opening section on a screen side of the deflection coil.

Abstract: The present invention provides a cathode ray tube which exhibits a favorable contrast by enhancing a speed modulation effect. A front-stage anode electrode and a focus electrode which constitute an electron gun are respectively divided into a plurality of portions. A plurality of portions of the divided front-stage anode electrode are arranged in the tube axis direction at given intervals and are electrically connected with each other. A plurality of portions of the divided focus electrode are arranged in the tube axis direction at given intervals and are electrically connected with each other. Due to gaps formed in the front-stage anode electrode and the focus electrode, the speed modulation effect is increased.

Abstract: A resistor for an electron gun assembly includes an insulating substrate, a plurality of electrode elements provided on the insulating substrate, a resistor element provided on the insulating substrate and having a pattern for obtaining a predetermined resistance value between the electrode elements, an insulating coating layer that covers the resistor element, a plurality of metal terminals that are connected to the associated electrode elements, and a lead-out wire that extends from at least one of the electrode elements and is electrically connected to the resistor element. By extending and connecting the lead-out wire to a desired position on the resistor element, the resistor is made adaptable to various alterations and a desired resistance division ratio can exactly be obtained.

Abstract: The Fe—Ni—Cr based alloy strip having improved press-formability is provided. The alloy strip essentially consists of from 15 to 20% of Cr, from 9 to 15% of Ni, the balance being Fe and unavoidable impurities, has 0.03% or less of cleanliness as stipulated under JIS G 0555, has final annealed temper and a preferred orientation texture in terms of 50% or less of degree of preferred orientation of the (111) plane in a central portion between the sheet surfaces which is expressed by the following formula: &agr;c(111)=[Ic(111)/{Ic(111)+Ic(200)+Ic(220)+Ic(311)}]×100(%), with the proviso Ic(hkl) is the integral X-ray diffraction intensity of the (hkl) plane.

Abstract: A funnel structure of a CRT in which provided that a deflection angle is 110° or more, a length of an outer surface evaluation line formed by connecting a TOR outer surface end where the funnel yoke portion and the funnel body portion meet and a neck seal outer surface end where the funnel yoke portion and the neck portion meet by a straight line is ‘a’ and a length of a straight line from the outer surface evaluation line where a vertical distance between the funnel yoke portion outer surface and the outer surface evaluation line is maximized, to the neck seal outer surface end is ‘b’, a formula of 0.20≦b/a≦0.40 is satisfied, so that a sensitivity of a deflection yoke is improved and a beam shadow neck margin of the electron beam can be satisfied.

Abstract: A display tube comprises an electron source (10), a module (20) provided with a guidance cavity (25R, 25G, 25B) for guiding electrons emitted by the electron source (10) to an exit aperture (27R, 27G, 27B) of the guidance cavity (25R, 25G, 25B) and beam-shaping means (30) for forming an electron beam (EBR, EBG, EBB) from guided electrons leaving the exit aperture (27R, 27G, 27B). The electron beam (EBR, EBG, EBB) travels towards a display screen (3). The beam-shaping means (30) are arranged to change a direction in which the electron beam (EBR, EBG, EBB) leaves the guidance cavity (25R, 25G, 25B) in accordance with a predetermined application. For example, the electron beam (EBR, EBG, EBB) is deflected to realize gun pitch modulation in the electron gun of a cathode ray tube. As the electron beam is deflected near the exit aperture (27R, 27G, 27B), spot errors are reduced and the display tube has a relatively high image quality.

Abstract: In a semi-toroidal deflection yoke, a middle point CL(M) of an entire length along a tube axis from a large-diameter portion to a small-diameter portion of a magnetic core lies on a small-diameter portion side of a horizontal deflection coil relative to a point lying at a distance of 0.41×HL along the tube axis from a large-diameter portion of the horizontal deflection coil, where HL is an entire length of the horizontal deflection coil along the tube axis. The deflection yoke deflects electron beams efficiently, reducing the deflection electric power the deflection yoke requires. A cathode ray tube provided with the deflection yoke can suppress pincushion type distortion which may occur in the vertical direction of a screen, and can therefore display images of satisfactory quality.

Abstract: A projection type cathode ray tube device includes a panel, a neck, a funnel connecting the panel to one end of the neck, and a stem closing the other end of the neck. An electron gun is housed in the neck for projecting an electron beam toward a phosphor screen on the panel. The neck includes a small-diameter neck portion disposed on its funnel side, a large-diameter neck portion disposed on its stem side, and a neck junction region connecting the small-diameter neck portion and the large-diameter neck portion. A deflection yoke is disposed in a vicinity of a transition region between the funnel and the small-diameter neck portion. A convergence yoke for generating a beam-convergence magnetic field is disposed to extend from the large-diameter neck portion and surround at least a portion of the neck junction region.

Abstract: Cathode ray tube having an electron gun which is modified with respect to the electron gun having three equidistant cathodes lying “in line”. The cathode for generating the green (central) beam is offset with respect to its position in an in-line gun, and the grids in the focus and/or triode part of the gun have been modified to provide at least one kink in the trajectory of the green beam to restore convergence.

Abstract: In a flat cathode-ray tube, there are problems that an axis of electron beam is separated before the electron beam enters a main lens due to magnetic field of a magnet disposed outside a neck, and coma aberration is generated to degrade an image quality. It is an object of the present invention to solve these problems. A flat cathode-ray tube comprises an electron gun 281 having a main lens 35M whose center coincides with a tube axis, a deflection yoke, and a magnet disposed outside a neck. An axis of a prefocus lens of the electron gun is separated from the tube axis.

Abstract: A cathode ray tube comprising an electron source and an electron beam guidance cavity having an input aperture and an output aperture, wherein at least a part of the wall of the electron beam guidance cavity near the output aperture comprises an insulating material having a secondary emission coefficient &dgr;1 for cooperation with the cathode. Furthermore, the cathode ray tube comprises a first electrode which is connectable to a first power supply for applying, in operation, an electric field with a first field strength E1 between the cathode and the output aperture. &dgr;1 and E1 have values which allow electron transport through the electron beam guidance cavity. The cathode ray tube further comprises a conventional main lens to obtain a spot on a display screen. According to the invention, an electron lens is placed between the exit of the cavity and the main lens for directing the electron beam at a predetermined angle towards the entrance of the main lens.

Abstract: According to an electron gun for a cathode ray tube of the present invention, in an electron gun for a cathode ray tube which performs correction of an electron beam by applying a correction magnetic field to an electrode of the electron gun, at least a part of an electrode in a region which is affected by the correction magnetic field comprises a bellows-like electrode. According to the arrangement, a high frequency correction magnetic field from outside the cathode ray tube penetrates into the electrode more so that a preferable electron beam correction effect can be attained without disturbing the magnetic field.

Abstract: The electron beam generating section in an electron gun assembly includes a cathode having an electron emitting surface. The surface of the cathode is divided into at least three regions of first, second and third regions which have different electron emission capabilities. The first region is arranged in the center of the surface of the cathode. The second region has its portions arranged on opposite sides of the first region in the horizontal direction. The third region has its portions arranged on opposite sides of the first region in the vertical direction.

Abstract: A color cathode ray tube has an electron gun in its neck portion. Its focus electrodes and anode are fixed by two insulating support rods. A voltage-dividing resistor is disposed in the vicinity of one of the insulating support rods for producing an intermediate voltage applied to a first one of the focus electrodes adjacent to the anode by dividing an anode voltage. The voltage-dividing resistor includes an insulating film, a resistance pattern, an insulating substrate, and a second film containing an oxide of transition metal, in the order named from the insulating film toward the inner wall of the neck portion. A metal conductor surrounding the voltage-dividing resistor and the one of the insulating support rods is fixed to a second one of the focus electrodes which is disposed upstream of the first one of the focus electrodes in a path of the electron beams.