| 摘要 |
PCT No. PCT/EP93/00084 Sec. 371 Date Sep. 14, 1993 Sec. 102(e) Date Sep. 14, 1993 PCT Filed Jan. 15, 1993 PCT Pub. No. WO93/14440 PCT Pub. Date Jul. 22, 1993.A method of automatically focusing glass-mounted and glassless slides, permitting quick and reliable focusing as a function of the thickness of the glass mount. According to the invention, the multiple IR radiation images of a mask aperture reflected from glass-mounted slides are focused onto a CCD line sensor. Number and spacings of the images are subsequently electronically detected with respect to their sequence on the CCD line sensor, the second image detected being projected onto a predetermined cell of the line sensor by shifting an autofocusing device and projection lens carrier by means of an electromechanical adjusting apparatus, the cell corresponding to a focused projection image of a glassless slide. Simultaneously, a signal is electronically produced corresponding to the spacing between a first and a second aperture image and cause the projection lens to be shifted by the adjusting apparatus within the autofocusing device carrier by the spacing determined.
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