# US 5,702,016 A · Braun tube for a projection television receiver

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 5,702,016 A
- Document ID: US5702016A
- Status: Granted
- Kind: A
- Application number: 08/359,209
- Filed: 1994-12-19
- Granted: 1997-12-30
- Earliest claimed: 1994-09-16
- Assignees: Goldstar Co., Ltd.
- Inventors: Dug Gyu Jang
- Web page: https://patentgrep.com/patent/US5702016A

## CPC

- H01J 29/894: {Arrangements combined with the vessel for the purpose of image projection on a screen (projection arrangements for image reproduction, e.g. using eidophor H04N5/74)}
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)

## Abstract

A Braun tube for a projection television receiver in which homogeneity of luminance in the peripheral portion of a screen is obtained by setting the screen width-to-length ratio to 16:9 with the curvature radius of the long side is less than that of the short side when the fluorescent surface is viewed from the outer circumference of a panel so that the main axis of the light incident to the peripheral portion of the screen is refracted more toward the center portion of the screen than the other portion thereof.

## Claims

### Claim 1

A projection television, comprising:
a screen; and
a Braun tube for a projection television receiver, the Braun tube including a fluorescent surface having a long side and a short side, wherein a curvature radius of the long side of the fluorescent surface is less than a curvature radius of the short side of the fluorescent surface, and wherein the fluorescent surface is convex relative to the interior of the Braun tube.

### Claim 2 (depends on 1)

The projection television of claim 1, wherein the screen has a width-to-length ratio of 16 to 9.