An ink jet recording apparatus records by discharging ink from plural recording heads toward a recording medium. Each of the recording heads has a heat pipe mounted thereon, and protruding therefrom so as to have a length which is greater than the recording width of the corresponding recording head....http://www.google.com.au/patents/US5451989?utm_source=gb-gplus-sharePatent US5451989 - Ink jet recording apparatus with a heat pipe for temperature stabilization
