One embodiment of the invention relates to a low profile electric generator having a short axial length. The marking device includes a pair of housings which are movably interconnected together so that a first one of the housings is further received within a second one of the housings responsive to compression of the housings between a hand and the print media. A product of a distance in the central axis direction and a distance in the circumferential direction of the journal shaft between the oil supply groove in next to each other on the inner surface of the bearing hole is within 50 to 300 mm2 range. A texture generation unit generates textures for respective levels corresponding to classified images by using the images classified according to resolution level.