Optical scanning apparatus and method for manufacturing cathode ray tubes
US4027312A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jun 23, 1976 |
| Grant date | May 31, 1977 |
| Priority date | — |
| Expiry date | Jun 23, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J9/2272
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An optical scanning apparatus for manufacturing cathode ray tubes having a faceplate with an inner surface layer of photosensitive material and an adjacent apertured mask wherein a light beam from a light source is applied to a deflection device controlled by a control circuit to effect deflection of the light beam at an angle related to the angle of incidence of an electron beam in a cathode ray tube. The deflected light beam is imaged onto the inner surface of the faceplate of the cathode ray tube through the apertured mask, and a device is provided for scanning the deflected light beam over the surface of the faceplate in a predetermined pattern to effect exposure of the photosensitive material in the proper locations for registration with the landing location of an electron beam in the cathode ray tube. The size and shape of the effective area occupied by the light beam at the scanning device is controlled to effect proper selection of the size and shape of the exposed photosensitive material in relation to the associated aperture in the mask. Depending upon the desired shape and size of the exposed photosensitive material on the faceplate, the light beam area at the scanning d…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.