Image forming apparatus having a device for measuring an origina

Details Image forming apparatus having a device for measuring an origina Image forming apparatus having a device for measuring an origina

1991-10-01

1992-07-28

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355214, G03G 2100

Patent

active

051344386

ABSTRACT:
An image forming apparatus is provided with an original density detecting device for detecting the original density, and output characteristic switching device for switching the output characteristic relative to the original density detected by the original density detecting device to a plurality of types of predetermined output characteristics. The original density is found on the basis of a predetermined output characteristic out of the plurality of output characteristics of the original density detecting device and an output of the original density detecting device. Then, an output characteristic showing a high rate of change in the vicinity of the original density found by the first original density measuring device out of the plurality of output characteristics is selected by selecting device. When the selected output characteristic is different from the output characteristic used for measuring the original density by the first original density measuring device, the output characteristic of the original density detecting device is switched to the selected output characteristic, and the original density is found on the basis of the selected output characteristic and the output of the original density detecting device by second original density measuring device.

REFERENCES:
patent: 4465358 (1984-08-01), Miura
patent: 4472046 (1984-09-01), Kohyama
patent: 4819022 (1989-04-01), Kurando
patent: 4831418 (1989-05-01), Ito et al.
patent: 4879576 (1989-11-01), Naito
patent: 4910554 (1990-03-01), Noda
patent: 4982232 (1991-01-01), Naito

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