Automatic density control device for use in copying machine

Details Automatic density control device for use in copying machine Automatic density control device for use in copying machine

1987-02-09

1988-03-22

Moses, R.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 14SH, 355 14D, G03G 1504, G03G 1506

Patent

active

047332760

ABSTRACT:
An automatic density control device in a copying machine combined with an automatic document feeder capable of feeding a document onto a document support table has a document density detector for detecting the density of a document placed on the document support table, a scanner means movable in a forward direction for exposure to the image of the document on the document support table and movable in a backward direction for enabling the document density detector means to read the density of the document on the document support table, a reference position detector for detecting when the scanner means reaches a reference position, and a controller for determining the density of the document from a document density signal from the document density detector means in a range prior to generation of a signal by the reference position detector means when the scanner means moves back to the reference position, for determining an amount of exposure or an image developing bias voltage based on the document density signal, and for producing an output indicative of the amount of exposure or the image developing bias voltage in response to a first signal from the reference position detector means after the document has been fed by the automatic document feeder.

REFERENCES:
patent: 4352553 (1982-10-01), Hirahara
patent: 4544258 (1985-10-01), Takano
patent: 4589767 (1986-05-01), Yanagi et al.
patent: 4627712 (1986-12-01), Usami
patent: 4684239 (1987-08-01), Takayanagi et al.

Affiliated with

Also associated with

Rating

Automatic density control device for use in copying machine does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Automatic density control device for use in copying machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic density control device for use in copying machine will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-445074