Abstract: A magnetic disc apparatus includes a casing for defining a sealed space, a magnetic disc disposed within the space, a spindle to which the magnetic disc is fixed, a motor for rotating the spindle, a flying head slider for writing and/or reading information in and/or from the magnetic disc and a carriage for translating the flying head slider. The magnetic disc apparatus incorporates an organic chemical compound capable of suppressing siloxane from being chemically changed to silicon oxide. The organic chemical compound contains at least one of monoalkyl-substituted benzene, dialkyl-substituted benzene, trialkyl-substituted benzene, fatty acid, fatty ester, alkyl ester of aromatic acid, thiazoles and phenols.

Abstract: An infrared spectrum measuring microscope apparatus which is suitable for accurately identifying the material at a microfine portion. A sample stage is vertically moved and special optical means are provided in the sample stage for enabling high-sensitivity spectral measurement of a microfine portion of samples of various sizes. The infrared microspectometer of the present invention also enables the chemical species of the sample to be identified by the fluorescence spectrum in addition to the information of the infrared spectrum.