Hitachi, Ltd.

Takumi Karasawa

Michio Tsukii

Takashi Atobe

Hiroshi Yoshioka

Takaaki Ishikawa

Kazuhiko Mizuno

Fumiaki Yonai

Eiichi Nishiyama

Kunio Shimada

Yasutoshi Katsume

Yukio Kuribayashi

Teruo Yokosouchi

Takashi Shimokawa

Taira Yarita

Katuhisa Oono

Kozo Tomiyama

A manufacturing method of cathode ray tube, wherein the voltage applied to the anode of an electron gun is divided by a voltage divider for application to focusing electrodes of the electron gun in the knocking process.

Manufacturing method of cathode ray tube

In a proposed color cathode-ray tube with deflection yoke, adjustment of static convergence and purity is performed by controlling the polarities and magnetization forces of a plurality of pole pieces made of metal alloy circumferentially held around the outer periphery. Tap bolts pressing the external wall of a funnel nearly in the perpendicular direction are so disposed on a deflection yoke mounting member as to be adjacent to the funnel of the color cathode-ray tube. The tap bolts press the funnel to fix the deflection yoke.

Color cathode-ray tube having deflection yoke

This invention is concerned with apparatus for automatically measuring misconvergence in the production of color Braun tubes or color display apparatus using color Braun tubes. This misconvergence measuring apparatus includes a photoelectric transducer of split light-sensitive structure which is disposed in front of the phosphor screen of a color Braun tube with a deflection yoke mounted, a deflection source for supplying to the deflection yoke a waveform for deflecting the electron beams of the color Braun tube by a constant unit at a time, and a control unit for detecting the excited bright position on the phosphor screen at which the photoelectric transducer produces the maximum output and for controlling the deflection source, whereby the output of the photoelectric transducer is measured for the respective three primary colors of red R, green G, blue B or color differences G-B, B-R and R-G, and when the maximum value or centroid position of each color or color difference is obtained, the desired amounts of horizontal and vertical misconvergence are automatically measured from the positional differences of horizontal and vertical deflection. Moreover, a maximum output detection circuit for a color Braun tube is provided in which the output waveform from the photoelectric transducer is clearly derived in the form of an approximately normal distribution by use of focus potential change.

Misconvergence measuring apparatus

A Braun-tube manufacturing apparatus comprises conveyor for conveying a Braun tube having a support portion arranged to stably support the Braun tube thereon stationary thereto with a faceplate thereof facing down, and a drying furnace disposed at an intermediate position on a conveying path of the conveyor for locally heating an area around the base where the resin is deposited to thereby dry and harden the adhesive resin. Such an apparatus enables not only rapid and reliable drying of the adhesive resin but also reductions in the size and cost of the drying furnace which can be used for drying.

Method of and apparatus for manufacturing Braun tubes

Growing community of inventors

Sakura, Japan

Takumi Karasawa