Tokyo Shibaura Denki Kabushiki Kaisha

Tokyo Shibaura Electric Co., Ltd.

Yukio Takanashi

Toshiharu Higuchi

Shouji Nakayama

Sakae Kimura

Kenji Takahashi

Toshiharu Matsuki

Fumiyuki Sato

Tooru Yakabe

Masanori Shinpo

Shunji Asano

Takashi Kuse

Touru Yakabe

Sadao Matsumoto

A cathode structure includes a thermal conductive member, a heater for heating a thermal conductive member, a metal substrate having a first surface facing a thermal conductive member and a second surface and attached to the thermal conductive member to form a space between a central portion of a second surface and the thermal conductive member, and an electron emitting member provided on a second surface of a metal substrate.

Cathode structure for electron tube

A quick operating type cathode having a cathode body consisting of: a cathode sleeve and a metal substrate which is mounted at the top opening part of the cathode sleeve and the top surface of which is coated with an electron-emissive material; and a double helical coil heater which is inserted within the cathode sleeve and the surface of which is coated with an insulating material, is characterized in that said heater comprises a coil part and a pair of leg parts connected to the end part of said coil part, a dense pitch part is formed at the top of said coil part, a sparse pitch part is formed in said coil part at the side of the leg parts and the amount of said coated insulating material per unit length of the coil wire at said sparse pitch part is larger than that at said dense pitch part.

Quick operating cathode

A cathode assembly for cathode-ray tube which comprises a cathode sleeve with a blackened surface, a first cylindrical reflective member fixedly put on the top end portion of the cathode sleeve with a fixing point therebetween and having one end portion closed up with a metal substrate, and a second cylindrical reflective member attached to the cathode sleeve by means of support members so as to be on the same axis with the cathode sleeve and having a diameter greater than that of the cathode sleeve, both the first and second cylindrical reflective members being provided for reflecting radiant heat from the cathode sleeve, and the length of the first cylindrical reflective member being set so that an angle formed between the longitudinal direction of the cathode sleeve and a straight line connecting a heat radiation peak point on the outer surface of the cathode sleeve and the inner edge of a top opening portion of the second cylindrical reflective member, on a plane passing through the same axis, may be 30.degree. or less.

Cathode assembly

Disclosed is a directly heated cathode assembly for a cathode ray tube electron gun, comprising

Directly heated cathode assembly

A directly heated type cathode assembly comprises a ribbon filament to a substantially central portion of which an electron-emitting substance is attached through a metal plate, a first support member on which one end portion of the ribbon filament is fixed to support the ribbon filament, the first support member being electroconductive, a second support member for supporting that portion of the ribbon filament which is a little short of the other end of the ribbon filament, a conductive spring member fixed to the other end portion of the ribbon filament, and a conductive cathode cylinder supporting the first support member, second support member and spring member and having a base at the filament side, the base of the cylinder having at least one opening.

Directly heated type cathode assembly

An electron gun asembly comprising direct heated cathodes each having an electron emitting member fixed on a filament which is stretched between a pair of support means disposed face to face with each other on a substrate and a plurality of grid electrodes containing first grids, said cathodes and grid electrodes being secured with predetermined distance with one another by insulative support rods. Each of the cathodes has a means adjusting the spacing between the first grid electrode and the electron emitting member.

Electron gun assembly for cathode ray tubes and method of assembling the

An indirectly-heated cathode device for electron tubes, comprising a hollow cathode sleeve of thin wall, a base metal mounted to one end of the sleeve and having the surface coated with an electron-emitting material, and a heater mounted within the sleeve. The sleeve is made of Ni-Cr alloy containing 2 to 35% by weight of Cr and predetermined amounts of additives including Co, W, Mo and/or Fe.

Indirectly-heated cathode device for electron tubes

The cathode electrode assembly of an electron gun assembly comprises an inner cathode cylinder supporting a base metal coated with an electron emitting material and an outer cathode cylinder coaxially supporting said inner cathode cylinder. Said outer cathode cylinder is supported at a first supporting point by a cathode holder fitted over said outer cathode cylinder. Said cathode holder is supported at a second supporting point by an electrode supporting piece supported by an insulating support pillar. Respective portions of the outer cathode cylinder and cathode holder are formed of the same quality of material.

Growing community of inventors

Hiratsuka, Japan

Yukio Takanashi