JPS6273670U - - Google Patents

Description

[Brief explanation of the drawing]

Figure 1 is a circuit diagram of an embodiment of the present invention, Figure 2 is a timing chart for explaining the operation of the circuit in Figure 1, Figure 3 is a circuit diagram of a conventional example, and Figure 4 is a diagram of the circuit in Figure 3. This is a timing chart for explaining the operation. LA1 is the first latch circuit, LA2 is the second latch circuit group, LA3 is the third latch circuit group, AD1 to A
D64 is an AND circuit group, and R1 to R64 are a heat generating resistor group.

Claims (1)

[Claims for Utility Model Registration] A first latch circuit to which print data composed of m bits is applied in parallel and sequentially latches the print data in response to a first latch signal; A second latch circuit includes a plurality of latch circuits that individually latch sequentially applied parallel print data in response to a second latch signal.
a group of latches; means for individually applying a second latch signal to each latch circuit in the second group of latches in response to a clock; and a number of latches equal to each latch circuit in the second group of latches; Each latch circuit has an output section for m bits,
a third latch circuit group that latches the print data from the second latch circuit group in response to a third latch signal when each latch circuit in the second latch circuit group finishes latching the print data; Each of the latch circuits in the third latch circuit group is composed of m AND circuits connected to each output section of each latch circuit, and outputs the print data latched in each of the latch circuits in response to a strobe signal. and a heat generating resistor of a thermal printing head, each consisting of m resistors, each resistor being individually connected to the output part of each AND circuit in the corresponding AND circuit group. comprising a body group,
Thermal printing head drive circuit in a thermal printing line printer.