Patent · US Expired

Shadow mask with porous insulating layer and heavy metal layer

US6320306A · kind A · utility

1Cited by

7References

8Claims

0Family size

Assignee

Samsung Display Devices Co., Ltd. · KR

Inventors

Gunter Heine · Capitola, US
Bernhard Schonert · Berlin, DE
Peter Neumann · Berlin, DE
Ulrich Schulke · Berlin, DE

Key dates

Filing date	May 12, 1999
Grant date	Nov 20, 2001
Priority date	—
Expiry date	May 12, 2019

Classification

Technology area (CPC H)Electricity
CPC primaryH01J2229/0777
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A shadow mask for color picture tubes has a cathode-side surface covered with a heat-insulating layer, an electron reflecting and absorbing layer, and a heat-emitting cover layer. Some of the electrons are reflected while others are absorbed in the cover layer and transformed to heat, but the heat does not act directly on the mask and is emitted into the interior of the tube. Local temperature differences which particularly occur with high contrast pictures and cause partial doming of the perforated mask are reduced.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.