A heater includes at least one heat generator which converts electric power to heat, at least one substrate on which the heat generator is formed, and at least one lead through which electric power is applied to the heat generator and which supports the substrate. The invention also relates to a patient support table, comprising a patient support surface, a lifting column and a foundation structure for fastening said patient support table to a floor surface. The hybrid polarizer further includes a second birefringent reflective polarizer disposed on the second major surface of the absorbing element, the second reflective polarizer having a second pass axis and a second block axis. Such a flow guide has been designed as an integral part of an ion source housing to provide for an optimal unidirectional flow past a sampling orifice of a mass spectrometer inlet. The flexible flat type heat pipe can be made thin, which allows for a variety of uses. In addition, provided is a recording head substrate on which are mounted energy generating elements that contribute to the formation of images by a recording head, and on which are mounted a plurality of head position detecting elements for detecting the position of the recording head.