LUBRICANT FILM THICKNESS MEASURING METHOD OF MAGNETIC DISK MEDIUM

• Main Authors: TERADA AKIRA, HOSHINO MITSUTOSHI
• Format: Patent
• Language: English
• Published: 09.07.1985
• Subjects: INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; PHYSICS; TESTING

PURPOSE:To derive easily and exactly a lubricant film thickness in a short time by irradiating X rays of a specified frequency to the surface, and measuring the lubricant film thickness basing on a signal area ratio regarding an intensity of an emitted photoelectron. CONSTITUTION:Both faces of a bustrate 1 are covered with a magnetic material layer 2, and the magnetic material layer 2 is protected by a lubricant holding layer 3 consisting of an inorganic silicon compound whose main component is SiO2, and a lubricant film 4. When this magnetic disk medium is cut to small pieces and irradiated under a high vacuum, a photoelectron jumps out with a constant kinetic energy at every constituent element. A binding energy of oxygen O1s of polyether fluoride being a material quality of the lubricant film 4 is a signal having a peak in the vicinity of 537.1eV, and a peak of a signal of an inorganic silicon compound being a material quality of the lubricant holding layer 3 is in the vicinity of 534.2eV. A lubricant film thickness is measured basing on an area ratio of these two signals.