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10
KX-PX1CX
4.3.
Thermal Head
4.3.1.
Function
This unit utilizes the state of the art thermal printer technology.
The ink film is chemically processed. The ink film is comprised of two parts: an ink dye layer and a base film. When the thermal-
head contacts this ink film, it emits heat momentarily, and the dye is profiled and sink into the paper.
The ink film is chemically processed. The ink film is comprised of two parts: an ink dye layer and a base film. When the thermal-
head contacts this ink film, it emits heat momentarily, and the dye is profiled and sink into the paper.
4.3.2.
Circuit Operation
Here are 10 driver ICs aligned horizontally on the thermal head and each one of these ICs can drive 128 heat emitting registers.
This means that one line is at a density of 128
This means that one line is at a density of 128
× 10=1280 dots=(11.8 dots/mm).
White/Black (white=0, black=1) data in one line increments is synchronized at CN9 pin 7 (CLK), and sent from CN9 pin
11~20(DATA10~1) to the shift register of the ICs. The shift registers of the 10 ICs are connected in parallel, and upon the shift of
dot increment 128, all the shift registers become filled with data, and a latch pulse is emitted to each IC from CN9 pin 23(LAT#).
With this latch pulse, all the contents of the shift registers are latched to the latch registers. Thereafter, through the addit-ion of
strobes from the CN9 pins (9 - 22) only black dot locations (=1) among latched data activates the driver, and the current passes
to heat the emitting body causing heat emission.
Here, the two line strobes, STB1# and STB2# impress at intervals of 5 msec, as required for one-line printout.
The sequence is shown on the next page. When the thermal head is not used, the Vth power supply for the thermal head driver
is not impressed to protect the IC.
11~20(DATA10~1) to the shift register of the ICs. The shift registers of the 10 ICs are connected in parallel, and upon the shift of
dot increment 128, all the shift registers become filled with data, and a latch pulse is emitted to each IC from CN9 pin 23(LAT#).
With this latch pulse, all the contents of the shift registers are latched to the latch registers. Thereafter, through the addit-ion of
strobes from the CN9 pins (9 - 22) only black dot locations (=1) among latched data activates the driver, and the current passes
to heat the emitting body causing heat emission.
Here, the two line strobes, STB1# and STB2# impress at intervals of 5 msec, as required for one-line printout.
The sequence is shown on the next page. When the thermal head is not used, the Vth power supply for the thermal head driver
is not impressed to protect the IC.
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