LTPH245 datasheet(32/64 Pages) SII

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3-19

3.6

CONTROLLING THE HEAD ACTIVATION (DST) PULSE WIDTH

3.6.1

Calculation of Head Activation Pulse Width

Head activation pulse width is calculated using the following equation (3).

To execute high quality printing using the printer, the value that is calculated using the following equation

(3) must be adjusted according to the environment the printer is used in. Calculate each value used

according to the steps in Sections 3.6.2 to 3.6.7 and control them so that the pulse width with the t

value obtained by substituting each value into the equation (3) is applied.

Printing using too high of a voltage or too long of a pulse width may shorten the life of the thermal head.

Equation (3):

t :

Head pulse width (ms)

E : Standard applied energy (mj)

See Section 3.6.2.

V : Applied voltage (V)

See Section 3.6.3.

R : Head resistance (

Ω)

See Section 3.6.4.

C : Head pulse term coefficient

See Section 3.6.6.

D : Heat storage coefficient

See Section 3.6.7.

3.6.2

Calculation of Applied Energy

Applied energy should be in accordance with the temperature of the thermal head and the environment

the printer is used in.

The thermal head has a built-in thermistor.

Measure the temperature using thermistor resistance.

Standard applied energy is based on a temperature of 25

°C. Calculate the printing energy using

equation (4) and the temperature coefficient.

Equation (4):

E= (0.260 - TC

× (T

X - 25) )

TX: Detected temperature using the thermistor (

°C) 1

TC : Temperature coefficient

0.003373

The thermistor resistance value at TX (

°C). See Section 3.6.8.

× R

t =

× C × D

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