Cathode ray tube with laminar cathode support
AssigneeU.S. Philips Corporation
InventorHenri J. G. M. Van Daelen
Life of this patent
Estimating the term…
Abstract
A cathode support, in an electron gun of a cathode ray tube comprising four lamellae (22, 24, 25, 30) which are connected together by means of an electrically insulating sealing glass (23). A first one of the lamella (22) engages a first electrode (10) of the electron gun. Second and third lamellae (24, 25) are situated substantially in one plane, are electrically-insulated from each other, and are cathode filament. The cathode shaft (33) is suspended from a fourth one of the lamellae (30). The cathode support is well suited for automated mass production.
Claims6
A cathode ray tube comprising an evacuated glass envelope containing a target and an electron gun for producing an electron beam directed at the target, said electron gun including an electrode and a cathode comprising a hollow cathode shaft and a filament extending into the shaft, said cathode being secured to the electrode by means of a cathode support comprising a plurality of spaced-apart metal lamellae secured to each other by means of electrical insulators, said lamellae including:
- (a) a first lamella electrically-connected to the electrode;
- (b) second and third lamellae secured to the first lamella, said second and third lamellae each spaced from the first lamella by substantially the same distance, each electrically-insulated from the other, and each electrically-connected to a respective lead of the cathode filament;
- and
- (c) a fourth lamella secured to and substantially equally spaced from the second and third lamellae, said fourth lamella being attached to the cathode shaft for supporting said shaft within the envelope.
A method of manufacturing a cathode ray tube comprising an evacuated glass envelope containing a target and an electron gun for producing an electron beam directed at the target, said electron gun including an electrode and a cathode comprising a hollow cathode shaft and a filament extending into the shaft, said cathode being secured to the electrode by means of a cathode support comprising a plurality of spaced-apart metal lamellae secured to each other by means of electrical insulators, said method including:
- (a) providing a plurality of bands each comprising a multiplicity of juxtaposed metal lamellae connected within the band by means of metal strips;
- (b) positioning said metal bands relative to each other to form stacks of said lamellae in a predefined arrangement;
- (c) securing the lamellae in each stack to each other by inserting sealing glass insulators between the lamellae and heating the glass to its melting temperature, thereby producing assembled stacks;
- and
- (d) cutting the strips to free the lamellae in the assembled stacks from their respective bands.
Dependencies are inferred from the claim text.