Abstract: In a laser scanner of the type having beam shaping means and a stationary diffraction grating for directing the shaped beam to a hologon scanning disc, the beam shaping means is combined with the stationary diffraction grating by providing a shaped stationary diffraction grating, thereby eliminating the need for other beam shaping means prior to the shaped diffraction grating, thereby simplifying construction of the apparatus.

Abstract: In a print head that has a plurality of inline light beams for simultaneously writing a corresponding plurality of lines of an image on a photoreceptor surface, the imaged spot size and center-to-center spacing are independently settable by projecting the light beams onto a diffusion screen which is spaced from the light sources by an amount needed to achieve a desired spot size. The spots on the diffusion screen are then imaged onto the photoreceptor surface by imaging optics with a desired magnification to achieve a desired center-to-center spacing between spots on the photoreceptor surface. For a given magnification value the photoreceptor spot size can be set by the spacing between the light source and the diffusion screen independent of the center-to-center spacing between the spots.

Abstract: A soft-edge stop for a laser beam includes a passing zone, a transition zone and a blocking zone. The transition zone includes a diffraction grating the diffraction efficiency of which varies progressively between a first value adjacent the passing zone and a second value adjacent the blocking zone. The passing zone may be clear, transmissive diffractive or reflective diffractive and the transition zone would be transmissive reflective in the first two cases and reflective diffractive in the third case.

Abstract: A multi-facet holographic scanner spinner is described in which each facet has a sector shape, it being bounded by radial lines and, usually, the periphery of the holographic scanner spinner. Each facet includes a diffraction grating pattern. The pattern in each facet extends to the radial lines bounding the facet in regions between a first and a second, greater radial distance from the axis of the holographic scanner spinner, but is spaced from the radial lines in regions radially outwardly of the second radial distance. Thus, the width of each facet is no greater than is necessary to perform its function and is less than a prior art facet performing the same function.

Abstract: A method for fabricating an ink jet droplet generator. According to the disclosed technique, a metallic body is first machined to define one or more ink receiving cavities and to further define an intended nozzle surface. Resist material is applied to the nozzle surface at the intended ink nozzle positions and a thin metallic plating formed on the surface. The resist and body are then etched to form one or more passageways from the ink cavities past the regions formerly occupied by the resist. These passageways form the generator nozzles.

Abstract: An ink jet printing machine in which adjacent nozzles are isolated from one another to prevent energization of a nozzle other than a selected nozzle.

Abstract: Color correction means for flash lamp are disclosed which utilizes a blue emitting organic phosphor medium to increase the total light output being emitted from the flash lamp and lower the Spectral Distribution Index (SDI) of the lamp-phosphor combination. The phosphor medium can be employed as a coating for the light-transmitting envelope of the flash lamp wherein the phosphor constituent is dissolved in a transparent film forming polymer. In certain preferred embodiments, further color correction of the flash lamp radiation can be effected with dyes incorporated into the protective cover means or containment lacquer now commonly employed.