Image recording apparatus having front/rear sheet face sensor

Details Image recording apparatus having front/rear sheet face sensor Image recording apparatus having front/rear sheet face sensor

1992-03-20

1993-08-03

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355308, G03G 2100

Patent

active

052333876

ABSTRACT:
An image recording apparatus which records an image of an original document on an image receiving sheet with the use of a photosensitive recording medium, the image receiving sheet having front and rear faces differing in reflection ratio. To detect error in sheet face orientation, a sheet face sensor unit is provided upstream of a pressure developing unit which discriminates a face of the image receiving sheet. The sensor unit includes a light emitting element for emitting light toward the face of the image receiving sheet and a light receiving element for receiving light emitted from the light emitting element and reflected on the face of the image receiving sheet. A central processing unit computes a reflection ratio based on the data supplied thereto and produces a discrimination signal indicative of the face of the image receiving sheet based on the reflection ratio being computed. A predetermined number of most recently detected data regarding light receiving amount at the light receiving element and the associated discrimination signals are accumulated in a memory. On the basis of the accumulated data, a threshold value for determining the face of the image receiving sheet or the light emission amount of the light emitting element is set.

REFERENCES:
patent: 4399209 (1983-08-01), Sanders et al.
patent: 4825257 (1989-04-01), Yoshino et al.
patent: 4830501 (1989-05-01), Terashita
patent: 5122830 (1992-06-01), Imaeda et al.

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