Focusing method for printer

Details Focusing method for printer Focusing method for printer

1988-06-24

1989-10-24

Hix, L. T.

Photocopying

Projection printing and copying cameras

Focus or magnification control

355 77, G03B 2734

Patent

active

048765686

ABSTRACT:
Disclosed is a focusing method for a printer which comprises the steps of: calculating a lens position and a conjugate distance at a set magnification value on the basis of an equation, changing the lens position within a predetermined range including the calculated lens position which serves as an original position, and conducting printing at each of these lens positions, selecting a lens position which provides an optimal focusing, correcting the equation using the selected lens position and the actual magnification employed when the selection is made, and calculating a lens position and a conjugate distance at another magnification value using the equation corrected when the selected lens position coincides with the original position and then changing the lens position and the conjugate distance accordingly.

REFERENCES:
patent: 3832058 (1974-08-01), Gusovius
patent: 4451142 (1984-05-01), Takenaka et al.
patent: 4585338 (1986-04-01), Nitsch et al.
patent: 4627721 (1989-12-01), Nguyen et al.
patent: 4643562 (1987-02-01), Kaneko et al.
patent: 4806988 (1989-02-01), Verner

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