Kabushiki Kaisha Toshiba

Canon Kabushiki Kaisha

Junichi Kimiya

Shigeru Sugawara

Eiji Kamohara

Takahiro Hasegawa

Hiroyuki Oda

Syunji Ookubo

Takashi Awano

Shunji Ookubo

Fumitaka Hoshino

Kumio Fukuda

Akira Hayama

Kazunori Satou

Osamu Ono

Fumihito Suzuki

A method of high precisely manufacturing, for an electron beam displaying apparatus, a support member which is equipped with an electrode on the surface thereof is provided. In this method, an electrode region is formed on the surface of a base material, the surface of the base material is ground by using a grinding stone having a convex portion, and at the same time a fringe portion of the electrode region is ground to form an electrode.

Method of manufacturing support member

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.

Resistor for electron gun assembly, electron gun assembly, and cathode-ray tube

A main lens section of an electron gun assembly comprises a fifth grid supplied with a focus voltage, a sixth grid supplied with a dynamic focus voltage, a first intermediate electrode, a second intermediate electrode, and a seventh grid. The main lens section includes an electric field lens acting commonly on the electron beams on a focus region side of the main lens section, which is formed by the fifth grid, sixth grid and first intermediate electrode, and a plurality of electric field lenses acting respectively on the electron beams on a divergence region side of the main lens section, which is formed by the second intermediate electrode and seventh grid.

Cathode ray tube including an electron gun with specific main lens section

In an electron gun assembly, its main convergence lens is composed of a focus electrode to which a focus voltage is applied, an anode electrode to which a high anode voltage is applied, and an intermediate electrode which is provided between the focus and anode electrodes and to which a high intermediate potential higher than the focus voltage and lower than the anode voltage is applied. The anode and intermediate electrodes are each a cylindrical unit long in the in-line direction. In the direction crossing at right angles with the in-line direction of the cylindrical units, the diameter of the opening in the anode electrode is set smaller than that of the opening in the intermediate electrode, thereby forming a multiple pole lens into a main electron lens of large aperture.

Color cathode ray tube

A dynamic focus electrode has a vibration-damping portion formed by a beading process at a peripheral portion of an electron beam passage hole thereof, a plate face thereof, or an embedment portion thereof. Thereby, vibration of the dynamic focus electrode is suppressed.

Cathode-ray tube apparatus

A main lens of an electron gun assembly comprises a sixth grid, a seventh grid, an eighth grid, and a ninth grid. An asymmetric lens section is created between a fifth grid and the sixth grid on a cathode side of the main lens. The asymmetric lens section has such asymmetry that lens functions of the asymmetric lens section acting on the electron beams are different between the horizontal direction and the vertical direction, and has a lens power varying in synchronism with the deflection of the electron beams. In this asymmetric lens, the asymmetry for a center beam differs from that for side beams.

A main lens is composed of a dynamic focus electrode, a first auxiliary electrode, a second auxiliary electrode and an anode, which are successively arranged in a direction of travel of electron beams. A sub-lens provided on a cathode side of the main lens is composed of a third grid, a fourth grid and a fifth grid. The first auxiliary electrode is connected to the fourth grid, and both are connected to a voltage supply terminal on a resistor near the fourth grid. A fixed focus voltage is applied to the third grid and fifth grid sandwiching the fourth grid.

Cathode ray tube apparatus including an electron gun assembly capable of dynamic astigmatism compensation

A main lens section of an electron gun assembly includes a focus electrode supplied with a focus voltage of a first level, a dynamic focus electrode supplied with a dynamic focus voltage obtained by superimposing an AC component, which varies in synchronism with deflection magnetic fields, upon a reference voltage close to the first level, and an anode supplied with an anode voltage with a second level higher than the first level. The electron gun assembly further includes at least two auxiliary electrodes disposed between the focus electrode and the dynamic focus electrode, and these at least two auxiliary electrodes are connected via a resistor disposed near the electron gun assembly.

In a cathode ray tube apparatus, an electron beam generating section for generating electron beams is composed of a cathode and a plurality of electrodes. Two electrodes of the plurality of electrodes are connected to each other via a resistor. A constant voltage is supplied from the outside of the tube to the one electrode, and a voltage dynamically changed in synchronism with a deflection magnetic field is supplied to an electrode adjacent to the other electrode. Therefore, the shape of a beam spot can be improved, and the resolution of the entire screen can be improved without requiring extensive provision of a lead wire of a stem.

Cathode ray tube apparatus with electron beam forming structure

A second grid is supplied with a low potential acceleration voltage. A fourth grid and a sixth grid are supplied with a first focus voltage. A third grid and a seventh grid are supplied with a dynamic focus voltage (Vf &plus;Vd). A prefocus lens having a horizontal and vertical focusing function is formed between the second grid and the third grid. An asymmetrical lens section having a horizontal diverging function and a vertical focusing function is formed between the third grid and the fourth grid. The prefocus lens and the asymmetrical lens section are electrostatically coupled.

An electric field expansion type main lens portion is constituted by including a focus electrode to which a focus voltage on a first level is applied, an anode electrode to which an anode voltage on a second level higher than the first level is applied, and two auxiliary electrodes to which a voltage on a third level higher than the first level and lower than the second level is applied and which are arranged between the focus electrode and the anode electrode. An electrode length of each of the two auxiliary electrodes along an electron beam traveling direction is constituted so as to differ in accordance with a difference in potential between electrodes arranged at front and rear positions in the electron beam traveling direction of each auxiliary electrode.

Cathode ray tube apparatus

An electron gun structure includes a first non-axial-symmetrical lens portion which is arranged in the vicinity of an electron beam formation portion, and a second non-axial-symmetrical lens portion formed to a main lens portion, the first non-axial symmetrical lens portion has a lens action in the vertical direction that a focusing action relative to the electron beams becomes stronger as a quantity of deflection of the electron beams increases, and a lens action in the horizontal direction which substantially rarely acts on the electron beams, and a comprehensive lens system of the second non-axial-symmetrical lens portion and the main lens portion has a lens action in the vertical direction that a divergence action relative to the electron beams becomes stronger as a quantity of deflection of the electron beams increases, and a lens action in the horizontal direction which substantially rarely acts on the electron beams.

The electron gun of a cathode ray tube comprises a main electron lens portion consisting of at least four electrodes arranged in the order of first grid ( ), second grid ( ), third grid ( ) and fourth grid ( ). An intermediate first voltage and an anode voltage are applied to the first grid ( ) and the fourth grid ( ), respectively. A resistor ( ) is connected at one end to the second grid ( ) and at the other end to the third grid ( ) positioned adjacent to the second grid, with the result that second and third voltages of substantially the same potential, which are intermediate between the first voltage and the anode voltage, are applied to the second grid and the third grid, respectively. These grids are arranged such that a second electrostatic capacitance between the second and third grids ( ) is smaller than any of a first electrostatic capacitance between the first and second grids ( ) and a third electrostatic capacitance between the third and fourth grids ( ). As a result, the lateral collapse phenomenon of the electron beam, which is brought about in a periphery of the screen by the difference in the lens magnification between the horizontal direction and the vertical direction, can be moderated, (making it possible to provide a cathode ray tube having satisfactory image characteristics over the entire region of the screen.

Cathode ray tube

A sixth grid, which is part of a main electron lens section, is made up of a first anode, an auxiliary electrode and a second anode. A fifth grid is applied with an intermediate voltage. The first and second anodes are applied with an anode voltage. An intermediate electrode and the auxiliary electrode are applied with a voltage whose level is between the levels of the intermediate voltage and anode voltage.

In the electron gun assembly of a cathode ray tube, a main electron lens portion is formed by a fifth grid to an eighth grid, and incorporates a quadrupole lens. The fifth grid receives a voltage obtained by superposing, on a voltage as a reference voltage, a dynamic voltage that parabolically changes with an increase when the electron beam is deflected amount of the electron beam. The sixth grid receives a voltage obtained by superposing, on a voltage as a reference voltage, a dynamic voltage that parabolically changes with an increase when the electron beam is deflected amount of the electron beam. The seventh grid receives the voltage, while the eighth grid receives an anode voltage.

Growing community of inventors

Kumagaya, Japan

Junichi Kimiya