| 摘要 |
PURPOSE:To make it possible to perform accurate observation, by observing a minute pattern through a liquid having the same refractive index as that of a protecting film, thereby eliminating the lens effect yielded by the curve of the protecting film. CONSTITUTION:The minute pattern of a thin-film magnetic head is coated by a protecting film 4, which is formed by sputtering. The entire thin-film magnetic head is immersed in a container 8, in which a liquid 9 having the same refractive index as that of the protecting film 4 is contained. The minute pattern is magnified and observed by a microscope 7 through the liquid 9. In this method, the lens effect of a curved part 5 of the protecting film due to the difference in refractive indexes of air and the film is eliminated, and a distance L between a tip part 6 of the head and a coil conductor 3 can be accurately observed. Thus the lens effect caused by the curve of the protecting film is eliminated and the accurate observation can be performed. |
