Document reader for a digital copier

Details Document reader for a digital copier Document reader for a digital copier

1988-10-28

1990-01-02

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358494, H04N 104

Patent

active

048917117

ABSTRACT:
A document reader applicable to a digital copier or similar image recording apparatus capable of reading any of a reflective and a transmissive document as desired. An effective image area smaller than an effective image area assigned to a reflective document is defined on a glass platen for a transmissive document. When a transmissive document is read, light transmitted through a differential area defined by the difference between the two effective image areas is sensed in the form of a reference voltage for the output voltages of an image sensor. The output of the image sensor is normalized for each main scanning on the basis of the reference voltage.

REFERENCES:
patent: 4486786 (1984-12-01), Sato et al.
patent: 4538185 (1985-08-01), Wiggins
patent: 4675741 (1987-06-01), Shinohara
patent: 4763200 (1988-08-01), Nakatani

Affiliated with

Also associated with

Rating

Document reader for a digital copier does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Document reader for a digital copier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Document reader for a digital copier will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1387013