PROBLEM TO BE SOLVED: To properly control force to be applied to a piston.SOLUTION: There is provided a non-contact type tonometer for measuring in a non-contact manner an intraocular pressure of a subject eye, the tonometer comprising: driving means for generating drive force by supplying a driving current fluid injection means for moving a piston in a first direction within a cylinder by driving the driving means, nd causing the piston to perform compression operation for injecting a fluid to a cornea of the subject eye and control means for controlling supply of the driving current to the driving means. The control means applies first driving force in the first direction to the piston by supplying the driving current in a forward direction to the driving means, and applies second driving force in a second direction opposite to the first direction to the piston by supplying the driving current in a direction opposite to the forward direction to the driving means.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】 ピストンに与える力を好適に制御できる。【解決手段】 被検眼の眼圧を非接触にて測定する非接触式眼圧計であって、駆動電流を供給することにより駆動力を生じる駆動手段と、前記駆動手段の駆動によってシリンダ内でピストンを第1方向に移動させて加圧動作をさせることによって被検眼の角膜に流体を噴出する流体噴出手段と、前記駆動手段への駆動電流の供給を制御する制御手段と、を備え、前記制御手段は、前記駆動手段に順方向の駆動電流を供給することによって前記ピストンに前記第1方向の第1駆動力を与え、前記駆動手段に順方向とは逆方向の駆動電流を供給することによって前記ピストンに前記第1方向とは逆方向である第2方向の第2駆動力を与えることを特徴とする。【選択図】 図1
