Optoelectronic device for recognizing contrast marks and method for reducing signal distortions for an optoelectronic device for recognizing contrast marks

摘要

PCT No. PCT/EP95/00893 Sec. 371 Date Nov. 29, 1995 Sec. 102(e) Date Nov. 29, 1995 PCT Filed Mar. 30, 1994 PCT Pub. No. WO95/27257 PCT Pub. Date Oct. 12, 1995An optoelectronic device for recognizing marks provided with defined contrast patterns includes a transmitting element that transmits a light beam and a receiving element. The beam of transmitted light is guided across the marks, and the received beam of light reflected from a mark exhibits an amplitude modulation which is impressed by the contrast of the mark and is dependent on the spatial course of intensity of the transmitted light beam. The received light in the receiving element is converted into an analog received signal. The analog received signal is converted, in an n-bit analog/digital converter, into a digital received signal which is supplied to a digital filter whose transmission characteristic is essentially equivalent to the inverse of the frequency spectrum of the spatial distribution of intensity of the transmitted light beam at the location of the mark.