A type of computer output device that can print characters one line at a time on paper. It is also called a line printer. Currently, they have been replaced by bubble jet and laser printers that can easily output graphics, and have almost disappeared. There are two types of impact printers: impact printers that mechanically strike the type and paper with a hammer to print, and non-impact printers that do not use a hammer. In the impact type, a type drum the same length as the width of the paper is rotated at high speed, and the paper is struck with an ink ribbon at the moment the character to be printed comes in front of the hammer. In this type, one set of type and one hammer are prepared for each column of printing positions. There is also a type where a chain with type set in it is rotated in front of the paper. Non-impact methods include the photographic method, in which recording is done using light on photosensitive paper, the thermal recording method, in which writing is done using heat on thermal paper, and the method that uses discharge destruction paper, all of which contain color-producing substances. [Yoshio Ohno] [Reference] |Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
コンピュータの出力装置の一つで、紙の上に文字を1行ずつ印刷できる機械をいう。行印字装置ともよぶ。現在では、図形なども容易に出力できるバブルジェット方式やレーザー方式のプリンターなどにとってかわられ、ほとんど姿を消した。活字や紙をハンマーで機械的にたたいて印字するインパクト方式と、ハンマーによらないノンインパクト方式とがあった。 インパクト方式では、紙の幅と同じ長さの活字ドラムを高速で回転させ、印字したい文字がハンマーの前にきた瞬間にインクリボンを挟んで紙をたたく形式が一般的である。この形式では、印字位置の1桁(けた)ずつに1組の活字とハンマー1個が用意される。活字を植えたチェーンを紙の前で回転させる形式もある。 ノンインパクト方式では、用紙自身が発色物質を含んでいるものとして、感光紙に光で記録する写真方式、感熱紙に熱で書き込む熱記録方式、放電破壊紙を用いる方式などがある。 [大野義夫] [参照項目] |出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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