Optical printer head which prevents dust from being generated therein or entering thereinto when in operation or disassembled

Abstract

An optical printer head capable of preventing catching between a filter holder and a luminous tube to prevent production of dust and attaining replacement of the luminous tube without exposing filters to an ambient atmosphere. A filter holder is arranged separately from a light source and an selfoc lens array, to thereby prevent production of dust from the filter holder due to contact of the filter holder with the light source and selfoc lens array. A base is arranged so as to receive only the filter holder therein, to thereby prevent the filters held on the filter holder from being exposed to an ambient atmosphere, resulting in dust being kept from adhering to the filters. A pair of light passages are formed on a light path and closed with a light-permeable cover to sealedly close the base, to thereby prevent dust from intruding into the base during replacement of the light source.