JPH0286737U

JPH0286737U -

Info

Publication number: JPH0286737U
Application number: JP16628288U
Authority: JP
Priority date: 1988-12-21
Filing date: 1988-12-21
Publication date: 1990-07-10

Description

[Brief explanation of drawings]

第１図は本考案の第１の実施例の回路図、第２
図は第１図の第１の実施例の動作を説明するため
の各部の波形図、第３図は本考案の第２の実施例
の回路図、第４図は第３図の第２の実施例の動作
を説明するための各部の波形図、第５図は従来の
印字ヘツド回路の一例に用いる１ピン当りの印字
ヘツド駆動回路の回路図、第６図は第５図の印字
ヘツド駆動回路の動作を説明するためのヘツド電
圧と印字出力パルス幅との相関を示す波形図であ
る。１……印字タイミングパルス、２……インバー
タ、３……節点Ａの波形、４……ツエナーダイオ
ード、５，７……ＯＲ回路、６……節点Ｂの波形
、８……印字出力パルス、９……コンパレータ、
１０，１１……インバータ、１２……印字ヘツド
のコイル、１４……印字データ、Ｑ_１〜Ｑ_４……
トランジスタ、Ｒ_１〜Ｒ_８……抵抗、＋ＶＨＥＡ
Ｄ……ヘツド電圧。 Figure 1 is a circuit diagram of the first embodiment of the present invention;
The figure is a waveform diagram of each part to explain the operation of the first embodiment shown in FIG. 1, FIG. 3 is a circuit diagram of the second embodiment of the present invention, and FIG. A waveform diagram of each part to explain the operation of the embodiment, FIG. 5 is a circuit diagram of a print head drive circuit per pin used as an example of a conventional print head circuit, and FIG. 6 is a circuit diagram of the print head drive circuit of FIG. 5. FIG. 2 is a waveform diagram showing the correlation between head voltage and print output pulse width for explaining the operation of the circuit. 1... Print timing pulse, 2... Inverter, 3... Waveform of node A, 4... Zener diode, 5, 7... OR circuit, 6... Waveform of node B, 8... Print output pulse, 9 ……comparator,
10, 11...Inverter, 12...Print head coil, 14...Print data, _Q1 to _Q4 ...
Transistor, R ₁ to R ₈ ... Resistor, +VHEA
D...Head voltage.

Claims

[Scope of utility model registration request]

A print head circuit for setting a print period corresponding to a print output pulse in a print head includes a pulse width control circuit configured with a delay circuit and controlling the print period by controlling the pulse width of the print output pulse. Characteristic print head circuit.