Abstract: A method of automatically checking digital camera images for dust on the image sensors of the associated cameras is disclosed that enables operators to check the performance level of digital cameras in real time and correct or take out of service those that do not pass the checking procedure.

Abstract: A high speed, high resolution raster output scanner having a single source beam; a beam splitter for separating the beam into at least two separate and parallel writing beams; an acousto-optic modulator having a substrate sized to provide a separate modulating channel for each writing beam to pass through without intruding into the other modulating channels; an rf transducer for each writing beam for generating separate acoustic waves in each modulating channel of the substrate; a control circuit for simultaneously intensity modulating the writing beams by the rf output of all transducers in accordance with separate lines of image signals; and optical means for simultaneously projecting the intensity modulated writing beams at points two lines apart on a recording member, the optical means including a polygon for scanning the writing beams across the recording member so as to write plural image lines at once.

Abstract: A raster scanner with laser for generating a scanning beam and compact folded optical system for transmitting the beam to the object to be scanned. The optical system includes a first mirror for guiding the laser beam forward along a downwardly inclined slope to the modulator, a second mirror below the modulator for intercepting the beam from the modulator and folding the intercepted beam to guide the beam backwards along a horizontal plane to a third mirror which folds the beam and guides the beam forward along an upwardly inclined slope against the mirrored facets of a rotating polygon, the polygon scanning the beam through a preset scan arc and returning the beam via a focusing lens to the third mirror, the third mirror folding the scan beam and guiding the scan beam forward, and a fourth mirror for intercepting the scan beam and guiding the beam to the object to be scanned.

Abstract: A raster scanner with laser for generating a scanning beam and compact, folded optical system for transmitting the beam to the object to be scanned. The optical system includes a first mirror for guiding the laser beam forward along a downwardly inclined slope to the modulator, a second mirror below the modulator for intercepting the beam from the modulator and folding the intercepted beam to guide the beam backwards along a horizontal plane to a third mirror which folds the beam and guides the beam forward along an upwardly inclined slope against the mirrored facets of a rotating polygon, the polygon scanning the beam through a preset scan arc and returning the beam via a focusing lens to the third mirror, the third mirror folding the scan beam and guiding the scan beam forward, and a fourth mirror for intercepting the scan beam and guiding the beam to the object to be scanned.

Abstract: A raster scanner with laser for generating a scanning beam and compact, folded optical system for transmitting the beam to the object to be scanned. The optical system includes a modulator for modulating the beam in accordance with video image signals and a rotatable polygon for scanning the beam across the object to be scanned. The laser is supported at one end in a spherical bearing, permitting rotation of the laser about a point coincident with the optical axis of the scanner and at a second remote end by screw type adjustors which are used to adjustably displace the laser about the pivot point and so align the axis of the laser beam with the optical axis of the scanner. Scanner operating circuits are provided including a circuit enabling one or both of the scan detectors to serve as a light meter when aligning the laser.