JPS5938055U - Thermal head protection circuit - Google Patents

Thermal head protection circuit

Info

Publication number
JPS5938055U
JPS5938055U JP13409282U JP13409282U JPS5938055U JP S5938055 U JPS5938055 U JP S5938055U JP 13409282 U JP13409282 U JP 13409282U JP 13409282 U JP13409282 U JP 13409282U JP S5938055 U JPS5938055 U JP S5938055U
Authority
JP
Japan
Prior art keywords
thermal head
protection circuit
head protection
head
heating elements
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP13409282U
Other languages
Japanese (ja)
Inventor
義則 松森
Original Assignee
三洋電機株式会社
鳥取三洋電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三洋電機株式会社, 鳥取三洋電機株式会社 filed Critical 三洋電機株式会社
Priority to JP13409282U priority Critical patent/JPS5938055U/en
Publication of JPS5938055U publication Critical patent/JPS5938055U/en
Pending legal-status Critical Current

Links

Landscapes

  • Electronic Switches (AREA)
  • Facsimile Heads (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【図面の簡単な説明】[Brief explanation of drawings]

第１図はサーマルヘッド駆動回路の従来例を示す図、第
２図は本考案の保護回路を具備したサーマルヘッド駆動
回路を示す図、第３図及び第４図は第２図要部の波形図
である。 １．１・・・発熱素子、２１〜２ｎ・・・第１駆動トラ
ンジスタ、３１〜３ｎ・・・第２駆動トランジスタ、４
・・・第１制御トランジスタ、５・・・電圧比較器、７
・・・第２制御トランジスタ、８・・・警報回路。Figure 1 is a diagram showing a conventional example of a thermal head drive circuit, Figure 2 is a diagram showing a thermal head drive circuit equipped with the protection circuit of the present invention, and Figures 3 and 4 are waveforms of the main parts of Figure 2. It is a diagram. 1.1... Heat generating element, 21-2n... First drive transistor, 31-3n... Second drive transistor, 4
. . . first control transistor, 5 . . . voltage comparator, 7
...Second control transistor, 8...Alarm circuit.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 多数の発熱素子よりなるサーマルヘッドを、所定数の発
熱素子を一組とし、夫々１つの駆動トランジスタでヘッ
ド電圧の印加を制御するよう構成した時分割駆動方式の
サーマルヘッドの駆動解路に於いて、夫の駆動トランジ
スタの故障を検出する手段と、該手段の出力で作動され
ヘッド電圧を遮断する手段を設けたことを特徴とするサ
ーマルヘッドの保護回路。A driving solution for a thermal head using a time-division drive method, in which a thermal head consisting of a large number of heating elements is configured to have a set of a predetermined number of heating elements, each of which controls the application of head voltage with one driving transistor. 1. A protection circuit for a thermal head, comprising means for detecting a failure of a husband drive transistor, and means operated by the output of the means for cutting off head voltage.
JP13409282U 1982-09-02 1982-09-02 Thermal head protection circuit Pending JPS5938055U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13409282U JPS5938055U (en) 1982-09-02 1982-09-02 Thermal head protection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13409282U JPS5938055U (en) 1982-09-02 1982-09-02 Thermal head protection circuit

Publications (1)

Publication Number Publication Date
JPS5938055U true JPS5938055U (en) 1984-03-10

Family

ID=30302250

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13409282U Pending JPS5938055U (en) 1982-09-02 1982-09-02 Thermal head protection circuit

Country Status (1)

Country Link
JP (1) JPS5938055U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04329011A (en) * 1991-04-30 1992-11-17 Murata Mfg Co Ltd Support jig for lead frame
JPH05212905A (en) * 1992-01-31 1993-08-24 Kyocera Corp Image forming device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04329011A (en) * 1991-04-30 1992-11-17 Murata Mfg Co Ltd Support jig for lead frame
JPH05212905A (en) * 1992-01-31 1993-08-24 Kyocera Corp Image forming device

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