PURPOSE: To make possible the detection of infrared rays from wide-range directions with excellent sensitivity by forming a pyroelectric material layer on a conductive substrate having the shape of a curved surface and further by providing an electrode on the pyroelectric material layer.
CONSTITUTION: A pyroelectric material layer 2 of lead titanate zirconate series is formed by a hydrothermal crystallization method on the surface of a thin titanium metal substrate (coductive substrate) 1 being machined into the shape of a cylinder and having a thickness of about 25μm and an electrode 3 for sensing light is provided on the pyroelectric material layer 2, whereby a pyroelectric element is constructed. As for a material compound containing constituent elements such as Pb, Zr and Ti which is used on the occasion of forming the pyroelectric material layer 2 by the hydrothermal crystallization method, chloride, oxychloride, nitrate, alkoxide, oxide or the like is preferable. Since the pyroelectric element is cylindrical, it can detect infrared rays with high sensitivity in relation to the incidence of the infrared rays from wide-range directions.
FUTAI HIROYUKI
HASHIMOTO KAZUO
KIMURA TAKAYUKI
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