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US 5,477,341 AGranted
Digital image forming apparatus
AssigneeRicoh Company, Ltd.
InventorMasahito Obata
Life of this patent
Estimating the term…
Abstract
A digital image forming apparatus having a scanner for reading a document, a memory for storing image data generated by the scanner, and a printer for outputing the image data read out of the memory. Only the image data representative of the actual document are written to the memory so as to use the memory efficiently.
Claims7
A digital image forming apparatus comprising:
- reading means for reading an image present on a document digitally;
- storing means for storing image data read by said reading means;
- width detecting means for determining a width of said document in a main scanning direction;
- read valid signal generating means for generating a read valid signal in response to an image data request signal from image forming means;
- read line counting means for counting, while said read valid signal is valid, lines sequentially read out of said storing means and outputting a count representing a number of lines counted;
- white data adding means for adding, on the basis of a count output from said read line counting means, white data to image data read out of said storing means;
- read address generating means for generating a read address of said storing means;
- read address setting means for setting an initial value of said read address in a main scanning direction for said read address generating means;
- and
- control means for calculating said initial value of said read address setting means on the basis of the width determined by said width detecting means.
7 more elements
A digital image forming apparatus comprising:
- reading means for reading an image present on a document digitally;
- storing means for storing image data read by said reading means;
- width determining means for determining a width of said document in a main scanning direction;
- document presence detecting means for detecting a presence of said document to produce a document presence signal while said document is being read from a leading edge thereof to a trailing edge thereof by said reading means in a subscanning direction;
- write line counting means for counting writing lines of said document while said document presence signal is being generated by said document presence detecting means and outputting a count representing a number of writing lines counted;
- write address generating means for generating a write address of said storing means on the basis of said count output from said write line counting means;
- write address setting means for setting an initial value of said write address in said subscanning direction for said write address generating means;
- and
- control means for calculating said initial value of said write address setting means on the basis of said width determined by said width determining means.
6 more elements
Dependencies are inferred from the claim text.