Thermal recording device

Details Thermal recording device Thermal recording device

1986-08-18

1989-06-27

Goldberg, E. A.

Recorders

Thermal recording

358296, 358298, G01P 1510, H04N 121

Patent

active

048434086

ABSTRACT:
A thermal recording device thermally records an image on a recording paper in the form of image segments gradated according to image information to collectively form the image. A thermal head has heating elements arranged in a row and activated to mark a row of dots on a recording paper. The thermal head is line-sequentially driven in the direction transverse to the row of dots to mark columns of dots to form a row-and-column arrangement of the dots such that the row-and-column arrangement is divided into a plurality of dot matrixes to define a plurality of corresponding image segments. A control circuit applies a control signal to the thermal head according to the image information to selectively activate the heating elements to thereby selectively mark dots in different densities during the line-sequential driving of the thermal head so that a specific pattern of selectively marked dots having different densities is formed within respective ones of the dot matrixes to gradate the image segments. The thermal head is divided into a plurality of thermal head blocks, each block including a predetermined number of heat elements and memory means for storing the control signal assigned to each block and effective to activate the heat elements of each block so that the plurality of blocks are time-sharingly activated during one line-sequential operation of the thermal head.

REFERENCES:
patent: 3354817 (1967-11-01), Sakarai et al.
patent: 4563693 (1986-01-01), Masaki
patent: 4567488 (1986-01-01), Moriguchi et al.
patent: 4568951 (1986-02-01), Hasegawa et al.
patent: 4639741 (1987-01-01), Inoue

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