Interface suppression apparatus and method for a linear modulator
US4483596A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 1, 1982 |
| Grant date | Nov 20, 1984 |
| Priority date | — |
| Expiry date | Mar 1, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/315
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In an electro-optic line printer of the type having a bit addressable linear modulator for modulating a sheet-like beam of light in response to pixel bits to expose the printer recording medium in line by line fashion. To suppress interference between the beam upper and lower sidebands, the beam is vertically polarized and a halfwave plate, disposed so that the axis thereof is at 45.degree. to the fourier transform plane, is inserted into the path of one of the sidebands to change the polarization of the one sideband from vertical to non-interferring horizontal. In a second embodiment, a halfwave plate is inserted into the path of each sideband, the axes of the plates being such as to form a 45.degree. angle therebetween whereby the sidebands are polarized at an angle of 90.degree. to one another, avoiding interference therebetween.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.