Thermal head

Details Thermal head Thermal head

1993-04-07

1994-04-19

Fuller, Benjamin R.

Recorders

Thermal recording

400 82, B41J 2335

Patent

active

053050215

ABSTRACT:
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.

REFERENCES:
patent: 4680593 (1987-07-01), Takeno et al.
patent: 5028935 (1991-07-01), Warmack et al.
patent: 5223855 (1993-06-01), Ota et al.
patent: 5223856 (1993-06-01), Kawata et al.

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