Abstract: An optical printer head capable of minimizing production of a ghost by incidence of light reflected on a filter holding hole. Light emitted from a light source is reflected out of a maximum allowable incident angle to minimize generation of a ghost due to incidence of reflected light on a selfoc lens array while reducing a size of a filter holding hole for holding each of filters therein. Also, a peripheral surface of the filter holding hole may be rendered rough, to thereby provide a scattering surface, resulting in preventing repeated reflection of light emitted from the light source on the peripheral surface of the filter holding hole.

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.

Abstract: A head drive mechanism capable of improving color shading in an exposed image due to a variation or nonuniformity in speed of a photosensitive head corresponding to pitches of teeth of a toothed belt. The photosensitive head includes a dot block which is constituted by a luminous dot group constituted of a line of a row A formed of even luminous dots and a line of a row B formed of odd luminous dots. Also, the rows A and B are so arranged that the luminous dots of the row A and those of the row B are offset from each other with an interval Ds being defined therebetween. A final transmission system is constituted of a toothed drive pulley, a toothed driven pulley and a toothed belt. The toothed belt is constructed so as to have tooth pitches Q=2Ds/(2n+1) reduced in terms of a relative travel distance of the head, wherein n is 0 or a positive integer.

Abstract: An optical printer capable of being decreased in the number of parts, small-sized and weight. A plurality of color filters are selectively alternated or changed with each other with respect to a common luminous section and such changing-over among the filters is carried out using a transfer unit for a print head, resulting in only one set of the luminous section and optical system being required. Also, power required for alternating or changing the filters with each other Is obtained by the transfer unit for the print head without arranging any specific unit.