Index-type color cathode ray tube
US5952767A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 1997 |
| Grant date | Sep 14, 1999 |
| Priority date | — |
| Expiry date | May 21, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2231/1255
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
First and second index signal phosphor layers are formed on a phosphor screen that is formed on the inner surface of a face plate. A rear plate is provided with first and second light sensing units for detecting signal lights from the first and second index signal phosphor layers, respectively. Each first light sensing unit includes a first light collecting plate, which radiates absorbing light having a radiation peak wavelength substantially equal to or shorter than the radiation wavelength of each first index signal phosphor layer. Each second light sensing unit includes a second light collecting plate, which radiates absorbing light having a radiation peak wavelength substantially equal to or shorter than the radiation wavelength of each second index signal phosphor layer. Arranged between each second collecting plate and the rear plate is a filter, which transmits the index signal light from the second index signal phosphor layer and shades the index signal light from the first index signal phosphor layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.