Method of correcting uneven densities in thermal recording appar

Details Method of correcting uneven densities in thermal recording appar Method of correcting uneven densities in thermal recording appar

1997-07-08

2000-07-18

Le, N.

Incremental printing of symbolic information

Thermal marking apparatus or processes

Density control

40012015, B41J 236

Patent

active

06091436&

ABSTRACT:
According to the improved method of correcting uneven densities in a thermal recording apparatus, on the basis of a preliminarily computed mathematical function that represents the relationship between the image data and the frictional force between the thermal recording material and the thermal head, a total sum of functional values corresponding to the image data of individual pixels in a present line, as well as a total sum of functional values corresponding to the image data of individual pixels in a preceding line are taken and the image data are corrected in accordance with the difference between the two total sums. This method can prevent effectively the occurrence of uneven densities due to the variation of recording density to provide for precise image recording.

REFERENCES:
patent: 4879566 (1989-11-01), Hanabusa
patent: 5235346 (1993-08-01), Yeung
patent: 5451984 (1995-09-01), Takamiya et al.
patent: 5677721 (1997-10-01), Suzuki et al.
patent: 5886724 (1999-03-01), Kuwabara et al.

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