Other

Hitachi, Ltd.

Hitachi Device Eng. Co., Ltd.

Panasonic Liquid Crystal Display Co., Ltd.

Hitachi Displays, Ltd.

Shoichi Wakita

Shoji Shirai

Nobuyuki Suzuki

Yasuo Tanaka

Toshio Nakayama

Shigemi Hirasawa

Kenichi Watanabe

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

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.

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

A cathode ray tube has a gun electrode construction which elongates horizontally a cross section of an electron beam and whose elongating strength weakens as a focusing voltage increases.

Cathode ray tube with improved resolution

A novel internal magnetic shield support apparatus for a color picture tube is disclosed, in which a mask frame is fixed on the interior of the periphery of a panel of the color picture tube, an internal magnetic shield is arranged along the inner wall surface of a funnel of the color picture tube, and the internal magnetic shield is secured to the mask frame with a buffer member interposed therebetween.

Growing community of inventors

Chiba, Japan

Shoichi Wakita