JPH0276043U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a circuit system diagram showing an embodiment of the thermal transfer gradation control device of the present invention, FIG. 2 is a signal waveform diagram for explaining the operation of the thermal transfer gradation control device of the present invention and the conventional one, and FIG. 3 4 is a detailed configuration diagram of the temperature sensor and correction preset means, which are the main parts of the present invention, FIG. 4 is an installation state diagram of the temperature sensor, which is the main part of the invention, and FIG.
The figure shows the correspondence between the temperature of the thermal head and the reheating time, Figure 6 is a system diagram of a conventional thermal transfer gradation control device, and Figure 7 is a diagram to which the thermal transfer gradation control device of the present invention can be applied. FIG. 1 is a schematic perspective view of an example of a main part of a thermal transfer printing device. 6, 33...Thermal head, 10...Data storage device, 11...Address counter, 12...Reference clock signal input terminal, 13...Start pulse signal input terminal, 14...Darkness data comparison circuit, 1
5...Data counter, 16...Shift register, 17...Latch circuit, 18...Control counter, 19, 21...AND circuit, 20...Heating preset source, 22...Correction table storage memory, 23... ...Pulse generator, 24, 37, 38...
...Temperature sensor, _G1 to _Gn ...Gate circuit, _R1
~ _Rn ...Heating resistor, _T1 ~ _Tn ...NPN
transistor.

Claims (1)

[Scope of Claim for Utility Model Registration] In a thermal transfer gradation control device that individually controls the time of each current flowing through a plurality of heating resistors arranged in a row according to the density to be printed, A temperature sensor that detects and outputs temperature data, a reheating preset circuit that determines reheating time based on the printed temperature data from this temperature sensor, and a preset reheating time supplied from this reheating preset circuit. a control counter that generates and outputs a signal corresponding to time; and according to the signal supplied from the control counter, maintains a value indicating the minimum concentration during the reheating time, and changes from the minimum concentration after the elapse of the reheating time. a data counter that generates reference concentration data that sequentially changes in a short time to a value indicating the maximum concentration; and a data counter that generates reference concentration data that changes sequentially in a short time to a value indicating the maximum concentration,
a grayscale data comparison circuit that generates control data indicating which heat generating resistor to which current should flow among the heat generating resistors in the plurality of heat generating resistors in a row for each unit of print density; a correction table storage memory that outputs correction data set so that the relationship between the recorded density and the reference density data becomes a straight line or a predetermined curve according to the inputted reference density data; 1. A thermal transfer gradation control device comprising: a current supply means to which control data is supplied, and for causing a current to flow through the heating resistor for a period of time corresponding to the value of the correction data, and which is indicated by the control data.