To make it hard to receive the effect of heat without complicating a manufacturing process even if a part is made large-sized because of many kinds of probes.
An ejection head 100 is constituted so as to discharge a probe solution to a plurality of the places of the surface of a solid-phase substrate 402 to fix the same in a two-dimensional array and equipped with a reservoir plate 102 having a liquid holding hole 111 for holding the probe solution formed thereto and the heater board 101 which is joined to the reservoir plate 102 on the same plane and to which an ejection nozzle for ejecting the probe solution to the surface of the solid-phase substrate 402 and the probe solution supply hole 110 communicating with the liquid holding hole 111 to supply the probe solution to the ejection nozzle are formed. A wiring board 104 for supplying a drive signal to a heater is joined to the reservoir plate 102 flush with the surface to which the heater board 101 is joined.
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HIROZAWA TOSHIAKI
Shinji Aida
Takaharu Takita