LTPH245 datasheet(35/64 Pages) SII

tên linh kiện	LTPH245

Giải thích chi tiết về linh kiện	LINE THERMAL PRINTER MECHANISM TECHNICAL REFERENCE

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nhà sản xuất	SII [Seiko Instruments Inc]

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3.6.7

Heat Storage Coefficient

In high speed printing, a difference in temperature arises between the rise in temperature of the thermal

head due to head activation and the temperature detected by the thermistor. Therefore, the activation

pulse must be corrected by simulating a rise in the temperature of the thermal head.

No correction is needed when the print ratio is low. When correction is not needed, set “1” as the heat

storage coefficient.

The heat storage coefficient is calculated as follows:

Prepare the heat storage software counters to simulate heat storage.

(a) Heat storage due to head activation

The heat storage counter counts up in each print period as follows.

T’=T+

T : Heat storage counter value

N : Number of the activated dots

(b) Radiation

The heat storage counter value is multiplied by the radiation coefficient in each 2 msec.

T’=T

×K

K : Radiation coefficient 0.996

Calculate the heat storage coefficient with the following equation (9).

Equation (9)

D=1-

31936

LTPH245 bảng dữ liệu(PDF) 35 Page - Seiko Instruments Inc