Lens and shutter positioning mechanism for variable-...

Details Lens and shutter positioning mechanism for variable-... Lens and shutter positioning mechanism for variable-...

G - Physics

03

B

314/40

G03B 27/72 (2006.01) G03B 27/34 (2006.01) G03B 27/50 (2006.01) G03G 15/041 (2006.01)

Patent

CA 1228637

Abstract of the Disclosure Apparatus for repositioning the lens of a variable-magnification electrophotographic copier to change the image-side path length for a different magnification ratio and for concomitantly adjusting the shutter to compensate for the changed image-side path length. Actuation of a stepper motor rotates a pulley to tension a cable coupled to the lens, pulling the lens to the desired position of a linear track. A portion of the cable extends around a pulley having an axially projecting circumferentially extending ramp on one face. A follower engaging the ramp is coupled to slit-forming members adjacent to the photocon- ductor so that movement of the cable to reposition the lens produces a concomitant adjustment of the width of the slit to equalize exposure of the photoconductor over a substan- tially continuous range of selected magnifications.

479921

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