Recorders – Printing – dotting – or punching marker – Ink transfer support or moving means
Patent
1981-02-24
1982-12-21
Griffin, Donald A.
Recorders
Printing, dotting, or punching marker
Ink transfer support or moving means
354 5, B41B 1714, G06K 1512
Patent
active
043652565
ABSTRACT:
The invention concerns a method to control accurately a light beam used for writing text or pictures in phototype-setting and similar applications. Rulings or gratings consisting of slits or lines are attached to the image surface frame and in some realizations to the optics frame. The light beam and in some realizations one or several reference beams, separated from the write beam, are made to fall on the rulings or gratings. The signal observed by photodetectors from the rulings give information on the relative positions of the light beams, the rulings and the image plane. This information is translated by electronic circuits into information of the position of the write beam on the image surface. By means of feedback mechanisms this information allows one to control the position of the write beam accurately. Also the method of deflecting the beam can be so construed that the modulation of the beam can be synchronized to the deflection to allow accurate positioning of the picture elements to the required positions.
REFERENCES:
patent: 3701999 (1972-10-01), Congleton et al.
patent: 3703137 (1972-11-01), Anderson et al.
patent: 3820123 (1974-06-01), Ammann
patent: 4044363 (1977-08-01), Morgan
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