| 摘要 |
PURPOSE:To obtain a uniform platinum film only on one of membrane electrodes, by method wherein a heat converting element which has a pair of membrane electrodes formed on a heat converting base material is immersed in an electrolyte and electrolytic voltage is applied to one of the electrodes to form the platinum block film while inverse voltage is preliminarily applied to the other electrode to which no black film is formed. CONSTITUTION:Platinum film 3A, 3B are applied to both front and back surface of a pyroelectric body 2 composed of LiTaO3 and gold lead wires 5 are mounted to the end parts of said films to constitute a heat sensor 1. This constitution, a platinum black film 4 is applied to one electrode 3A becoming a heat absorbing surface by electrolysis not only to improve heat absorbability but also to enhance detection sensitivity but, in order to prevent the generation of the black film 4 on the electrode 3B of the rear, the following method is taken. That is, the heat sensor is immersed in a 57.9mM platinum chloride electrolyte 6 containing 10mg of acetate and the electrode 3A is opposed to an opposed electrode 7 through a monitoring reference electrode 8 and voltage of about -0.2--0.7V is applied between the electrodes 3A, 7 and voltage of about +1.0--0.2V is applied between the electrodes 3B, 8.
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