Abstract: A self-adjusting, adjustable, light-diffusing mechanism adapted for use in an optical scanner and including a light source to be projected on or transmitted through an object to be scanned, such as a photograph or transparency, including a light-permeable plate extending along the length and width of the light source, and having a varying degree of thickness so as to permit a varying degree of light transmitted therethrough and onto the object to be scanned, and, including a reflector positioned on the side of the light source opposite the light-diffusing mechanism and including at opposed ends of the reflector enlarged, convergent reflecting surfaces which function to focus light from the opposed ends of the light source to a target area so as to make the illumination intensity at the target area substantially uniform throughout the length of the light source, and so as to easily and conveniently adjust and control the degree of illumination projected on or through the object to be scanned.

Abstract: An adjusting mechanism for a lens comprises a mount, a sphere, a pressing ring, a positioning housing, a fixing ring, a lens, and an adjusting ring. Three protruding members are provided radially and horizontally around the circumference of the sphere. The sphere is stably disposed on the mount in an opening having a spherical surface provided on the center of the mount by three tension springs each secured between the protruding members and the mount. The inside of the sphere forms cylindrical space to accommodate the lens. The lens only axially moves with respect to the sphere by turning an adjusting ring screwed onto the sphere. The positioning housing is fixed on the mount around the sphere and the fixing ring is fastened on the top of the positioning housing.

Abstract: A filter lens device for an optical color scanner comprising a lens, at least three filters and a driving member to drive the filters to line up with scanned data and optical detectors wherein an entire document is scanned completely for each color to be reproduced. A position detecting member detects the relative positions between the filters and optical detectors, a position controlling member controlling the driving member such that the filters are moved in sequence to scan the document.

Abstract: By means of a timer and by setting the compensation for the lag error, the correctness of automatic drift compensation in a position-loop controller is enhanced and the accuracy of position control is also improved. In the present invention, a method and a device for automatic drift compensation in a position-loop controller are disclosed which enable accurate displacement control so as to avoid inadvertent shutdowns of the system.