Abstract An optical printer comprises a mechanical scanner, which scans a modulated light beam across a recording medium in a main or horizontal direction at a fixed speed. An acousto-optic deflector performs auxiliary scanning of the beam in a vertical direction onto the mechanical scanner at a constant rate and is connected to a deflection signal generator. The deflection signal generator adjusts the stroke length of auxiliary scan in accordance with the magnification ratio and simultaneously adjusts the frequency of auxiliary scanning by the reciprocal of the magnification rate of the character to be printed. Furthermore, optical density is maintained constant for various character sizes by providing auxiliary gate pulses proportional to the square of the relative character size, which are AND gated with a character information signal to effect a light modulation signal for modulating the beam.
An optical printer comprising: an illumination source generating a beam of light, a recording medium, a main scanning member in the path of said beam for scanning said beam at a fixed speed in a main direction across said recording medium, an acousto-optic deflector located in the path of said beam between said main scanning member and said illumination source, said deflector scanning said beam onto said main scanning member in a direction transverse to said main direction, a deflection signal generator operatively connected to said deflector for adjusting the stroke length of auxiliary scanning in accordance with the magnification ratio of a character to be printed and for simultaneously adjusting the frequency of auxiliary scanning by the reciprocal of the magnification ratio of the character to be printed.
Claim 2
Dependent Claim
129 words
An optical printer comprising: an illumination source generating a beam of light, a recording medium, a main scanning member in the path of said beam for scanning said beam at a fixed speed in a main direction across said recording medium, an acousto-optic deflector located in the path of said beam between said main scanning member and said illumination source, said deflector scanning said beam onto said main scanning member in a direction transverse to said main direction, a deflection signal generator operatively connected to said deflector for adjusting the stroke length of auxiliary scanning in accordance with the magnification ratio of a character to be printed and for simultaneously adjusting the frequency of auxiliary scanning by the reciprocal of the magnification ratio of the character to be printed.