| 摘要 |
PURPOSE:To increase the measuring speed of hardness by shortening the time required in measurement, by simultaneously measuring the hardness of an article to be measured in such a state that a diamond pressure element is penetrated under pressure. CONSTITUTION:An inner cylinder 16 is received in an outer cylinder 15 through a spring 17 and the diamond pressure element 18 fixed to the leading end of the inner cylinder 16 is pressed to a specimen 20. If the leading end of the outer cylinder 15 is pushed in the specimen 20 until it is brought into contact with the measuring surface thereof, the pressure element 18 is pressed to the specimen 20 by the constant spring force due to the spring 17. Measuring light is reflected from the light source part 22 arranged to the upper part of the inner cylinder 16 to be incident to the pressure element 18 through a half mirror 25. The reflected light from the pressure element 18 is inputted to an image converting device 29 through an impression trace image detecting optical system 23. The device 29 photoelectrically converts the impression trace image detected by the reflected light from the pressure element 18 to an electric signal which is, in turn, sent to an image processing unit 31. Herein, the length of the diagonal of the impression is automatically operated from the impression image converted to the electric signal and the hardness of the measuring surface of the specimen is calculated to be displayed on a display part 32. As mentioned above, by simultaneously measuring hardness in such a state that the pressure element is penetrated under pressure, a measuring speed can be increased.
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