JPS6441828A - Contact pressure measuring apparatus - Google Patents

Abstract

PURPOSE:To determine a contact pressure between two members, by checking intensity of interference light due to reflected light from contact surfaces of two members pressure welded independently at each of two wavelengths to detect a clearance formed between the two members. CONSTITUTION:Light emitted from a light source 7 forms an image on a dichroic mirror 9 and light below a wavelength lambda0 is transmitted and light with a center wavelength lambda1 is incident into a dichroic mirror 14 through a filter 10. On the other hand, out of the light above the wavelength lambda0, light with a center wavelength lambda2 is made incident into the mirror 14 through a filter 13 and combined with that with the wavelength lambda1 to be irradiated to a simulation head 18. Light with the wavelengths lambda1 and lambda2 is reflected on a contact surface 18a and a contact surface 19a of a recording medium 19 and turned to separate interfering light depending on an optical path difference thereof to form an image on an opto-electric transducer 21, which is stored into a waveform memory 23. A data of the device 23 is applied to an arithmetic device 24 to determine a clearance between the medium 19 and a head with the application of a pressure. Thus, a contact pressure distribution is computed from the distribution of the clearance and modulus of elasticity.