| 摘要 |
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 DEG 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 DEG angle therebetween whereby the sidebands are polarized at an angle of 90 DEG to one another, avoiding interference therebetween.
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