Abstract: A device for use in a system of hologon deflection of a laser beam having a wavelength .lambda. at a rotating angle .theta..sub.R to produce a scan line. The device comprises a prism having a grating on at least one surface. The prism is positioned to deflect the scan line after hologon deflection of the laser beam. The prism has an apex angle between scan line intersecting surfaces of .theta..sub..alpha.. The grating has a grating spacing D. Deflection of the scan line by the angle .theta..sub..alpha. is designed so that it is equal to the deflection of the scan line by the grating. This produces a scan line having bow of less than 1/600 of the bow of the scan line without the prism and effectively eliminates wobble. The range for the apex angle .theta..sub..alpha. may be from about 1.degree. to about 30.degree., and preferably from about 2.degree. to about 6.degree.. The grating spacing ranges from about 0.0001 to about 0.001 millimeter.

Abstract: A precision glass jig is formed to properly position ribbons of optical fibers for the area end of a fiber optic bundle forming the entrance field of an optical subsystem for an electronic printer. The opposite ends of the ribbons are aligned side-by-side and coupled against an electrostatic drum. The ribbons are inserted into slots in the glass jig, each ribbon providing a bearing surface for guiding the adjacent ribbon into the respective slot. A spacing tool may be used to temporarily separate adjacent ribbons for ensuring initial alignment and also for guiding insertion of the ribbons into the slots.