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41. 发明授权

US5305021A Thermal head 失效
标题翻译：热头
公开(公告)号：US5305021A
公开(公告)日：1994-04-19
申请号：US44548
申请日：1993-04-07
申请人： Shigenori Ota , Kenji Nakai , Akihiro Kawata
发明人： Shigenori Ota , Kenji Nakai , Akihiro Kawata
IPC分类号： B41J2/335 , B41J2/345
CPC分类号： B41J2/33535 , B41J2/3357 , B41J2/33575 , B41J2/345
摘要： A wide-spanning thermal head used in a printer comprises a plurality of radiator metal plates attached to a metal support plate and a plurality of head substrates formed from ceramics or the like, one each attached on top of each radiator plate. A construction in which the end faces of the head substrates are made to abut against each other requires highly precise work and involves technical difficulty. Any variation in the gap between the end faces will result in the occurrence of a white streak degrading the print quality. To avoid this, the invention provides a construction in which the radiator plates are attached to the support plate with a gap provided between the radiator plates in such a manner that the ends of the head substrate on each radiator plate protrude beyond the corresponding ends of the radiator plate by a protruding amount d. Accordingly, as the head substrates and the radiator plates are heated up with the use of the thermal head, the radiator plates having a greater thermal expansion coefficient expand to a greater degree than the head substrates do. The difference in thermal expansion is accommodated by the protruding amount d so that a predetermined close gap is provided between the end faces of the head substrates. This serves to prevent degradation of the print quality.
摘要翻译：在打印机中使用的广泛的热敏头包括附接到金属支撑板的多个散热器金属板和由陶瓷等形成的多个头基板，每个头基板安装在每个散热板的顶部。使头基板的端面彼此抵接的结构需要高精度的工作并且涉及技术难度。端面之间的间隙的任何变化将导致白色条纹的发生降低打印质量。为了避免这种情况，本发明提供了一种结构，其中散热板被附接到支撑板上，在散热板之间具有间隙，使得每个散热板上的头基板的端部突出超过相应的端部散热板由突出量d。因此，随着头基板和散热板被使用热敏头加热，具有较大热膨胀系数的散热板相对于头基板的扩展程度更大。通过突出量d容纳热膨胀差，使得在头基板的端面之间设置预定的紧密间隙。这用于防止打印质量的降低。

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