Automatic CRT exposure regulation
US4418279A · kind A · utility
2Cited by
3References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1981 |
| Grant date | Nov 29, 1983 |
| Priority date | — |
| Expiry date | Sep 28, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J9/2272
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method and apparatus are disclosed for altering the exposure time of a master timer in a CRT light house to accommodate masks having different aperture sizes. For each expected aperture size, an exposure time modifier is pre-stored, the aperture size of a mask is sensed, and the modifier corresponding to the mask's aperture size is automatically selected. The selected modifier is used to alter the rate at which the master timer times out so as to provide an exposure interval appropriate for the mask being processed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.