Other

Toshio Nakayama

Nobuyuki Suzuki

Yasuo Tanaka

Shoji Shirai

Shoichi Wakita

Akiyoshi Tobe

Kouichi Harasaka

Syoichi Wakita

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.

Cathode ray tube

A cathode ray tube has an anode and a focus electrode. The large-diameter cylinder portion of the focus electrode is disposed concentrically within a large-diameter cylinder portion of the anode. The anode and a first electrode facing a cathode side end of the focus electrode are electrically connected together within the cathode ray tube. The following relationship is satisfied: &minus;LP&plus;184.9&gE;LG &gE;0.0004 LP &minus;0.1571 LP &plus;21.006 LP&minus;922.41, where LG (mm) is an axial length of the focus electrode, and LP (mm) is a distance from a phosphor screen side end of the focus electrode to a center of a phosphor screen.

Cathode ray, tube including an electron gun having specific relation of axial length of focus electrode and focus electrode-screen distance

There is provided a cathode ray tube capable of displaying high quality images by suppressing eddy current from occurring and by realizing the velocity modulation. A cylindrical focusing electrode is divided into first cylindrical focusing electrode B and second cylindrical focusing electrode T and the gap between the both electrodes formed and divided by optimizing the length of the second cylindrical focusing electrode T in the tube axial direction is enlarged substantially to increase the infiltration of the velocity modulating magnetic field to the non-electric space of the focusing electrode . An electrode having the equal potential with the focusing electrode is disposed at the gap to suppress eddy current from being generated.

A lens structure of a pre-focus part of an Hi-UPF electron gun to be used for a cathode ray tube has a cathode, a control electrode, an acceleration electrode, a first anode, a focus electrode and a second anode arranged in this order. The first anode and the second anode are to be commonly supplied with an anode voltage, and the focus electrode is to be supplied with a focus electrode. In a cathode ray tube of this construction, in the pre-focus part, the control electrode has an electrode beam passage hole of 0.57 mm or smaller and the distance in the vicinity of the electron beam passage hole between the acceleration electrode and the first anode is 1.9 mm or smaller.

Cathode ray tube with UPF type electron gun having particular electrode structure and spacing

A cathode ray tube has an anode of a large-diameter cylinder portion on its phosphor screen side and a small-diameter cylinder portion on its cathode side connected together, and a focus electrode formed of a large-diameter cylinder portion of a diameter larger than that of the small-diameter cylinder portion of the anode and a small-diameter cylinder portion having a diameter smaller than that of the small-diameter cylinder portion of the anode, the large-diameter and small-diameter cylinder portions being connected together. The large-diameter cylinder portion of the focus electrode is disposed concentrically within the large-diameter cylinder portion of the anode. The anode and a first electrode facing a cathode side end of the focus electrode are electrically connected together within the cathode ray tube. The following relationship is satisfied: &minus;LP&plus;184.9&gE;LG &gE;0.0004 LP &minus;0.1571 LP &plus;21.006 LP&minus;922.41, LP&gE;131.7, where LG (mm) is an axial length of the focus electrode, and LP (mm) is a distance from a phosphor screen side end of the focus electrode to a center of the phosphor screen.

Growing community of inventors

Shirako, Japan

Toshio Nakayama