Thin film forming apparatus

A thin film forming apparatus comprising:

• an intaglio roll (3) rotatably supported by a supporting frame (2) of a base (1) and having a screen having a great number of diagonal or latticed regular recesses (3b, 3d, 3f) on a surface thereof;
• a doctor (6), mounted on the supporting frame (2) at a predetermined position in a periphery of the intaglio roll (3), for spreading ink supplied to the intaglio roll (3) on the surface of the intaglio roll (3) so that a certain amount of ink is held in the recesses (3b, 3d, 3f);
• a printing roll (4) adjacent to the intaglio roll (3), rotatably supported by the supporting frame (2), rotatable in synchronization with the intgalio roll (3), having a desired pattern, capable of contacting the surface of the intaglio roll (3), and having a projection (4a) to which the ink held in the recesses (3b, 3d, 3f) of the intaglio roll (3) is transferred when the printing roll (4) contacts the surface of the intaglio roll (3);
• a surface plate (11) for placing and retaining a material to be printed (10) thereon and capable of reciprocatively moving on the base (1) synchronously with a peripheral speed of the printing roll (4) between a printing position (A) at which the material (10) contacts the printing roll (4) and a position (B, C) spaced from the printing roll (4);
• a driving device (7) for driving the intaglio roll (3) and the printing roll (4);
• a surface plate driving device (12, 13, 14) for moving the surface plate (11) between the printing position (A) and the position (B, C) spaced from the printing roll (4);
• and
• an intaglio roll moving device (16, 7, 65) for moving the intaglio roll (3) by a distance (y) found by the following equation in a printing direction and/or by a distance (x) found by the following equation in a direction perpendicular to the printing direction:
• ##EQU19## where p is a pitch of banks (3e, 3g) of the intaglio roll (3);
• n is an integer;
• .theta. is an angle of a screen made on the surface of the intaglio roll (3) between a direction of a rotary shaft of the printing roll (4) and the recesses (3b, 3d, 3f) as well as the banks (3e, 3g) of the diagonal or latticed screen of the intaglio roll (3).