Image forming apparatus and method for maintaining set magnifica

Details Image forming apparatus and method for maintaining set magnifica Image forming apparatus and method for maintaining set magnifica

1994-06-24

1995-09-12

Rogers, Scott A.

Facsimile and static presentation processing

Facsimile

Image reproduction system

358406, 358451, 358300, 347256, 347134, H04N 1036, H04N 104, H04N 1113, H04N 1393

Patent

active

054502110

ABSTRACT:
A copying machine for forming an image by scanning a laser beam which is emitted from an optical system on a photosensitive member. Photosensors are provided at optically equivalent positions to a beginning portion and an end portion of a scanning line on a photosensitive member. A scanning time of a laser beam in the main scanning direction is measured by these photosensors. The measured time and a standard time for a copy magnification set by an operator are compared, and a correction value is calculated, and at the same time, magnification in the main scanning direction is corrected using the correcting value. Also, focusing (adjusting of the beam diameter) is carried out using the photosensors. Each of the photosensors contains a photoelectric transfer element, and a beam which comes through a slit is incident to the element. Each photosensor is provided with two slits. One is perpendicular to the main scanning direction, and the other is inclined to the main scanning direction. The beam diameter in the main scanning direction is adjusted based on detection of the beam which comes through the slit which is perpendicular to the main scanning direction. The beam diameter in the sub scanning direction is adjusted based on detection of the beam which comes through the slit inclined to the main scanning direction.

REFERENCES:
patent: 4888650 (1989-12-01), Abuyama
patent: 5130839 (1992-07-01), Tomita
patent: 5233455 (1993-08-01), Yamaguchi et al.
patent: 5309205 (1994-03-01), Hayano

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