Composite shiftable aperture mask
US5686784A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 1995 |
| Grant date | Nov 11, 1997 |
| Priority date | — |
| Expiry date | Mar 13, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/0772
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A composite shadow mask for a cathode ray tube or the like having a first shadow mask and a second support shadow mask shiftably positioned with respect to each other, with the first shadow mask made of a first material of a first thickness with the first shadow mask having a first set of openings therein, and a second shadow mask made of a second material of a second thickness, with the second shadow mask having a second set of openings so that when the first shadow mask is placed in surface-to-surface contact with the second shadow mask, the first set of openings and the second set of openings are in register with one another to thereby permit passage of an electron beam to be defined by openings in the first shadow mask even though the masks can shift with respect to each other during use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.