High precision projector is a fine university measuring instrument integrating light, machine and electricity. The workpiece image can be full positive image or inverted image, the measurement is simple and intuitive, and the efficiency is high. The instrument has excellent optical quality, clear objective lens and accurate magnification. The error of contour measurement is less than 0.08% under the illumination of transmitted light. It is widely used in machinery, instrumentation, electronics, light industry and other industry colleges, research institutes, metrological verification departments. The projector can efficiently detect the contour size and appearance of various complex workpieces, such as models, stamping parts, cams, threads, gears, forming milling cutters, etc. The working principle of high precision projector: The projector has a lens equivalent to a convex lens, and after the threaded lens illuminates the pattern or text of the transparent film, the light emitted through the convex lens will focus on the ceiling. For easy viewing, a flat mirror is installed above the convex lens to change the direction of the light, so that the light shining on the ceiling is cast on the screen. In the experiment of "convex lens imaging law", when the object distance is greater than the focal length is less than twice the focal length, the image is inverted and enlarged. The image distance is greater than twice the focal length. Functional features of high precision projector: The light emitted by the projector light source is reflected to the measured object through the condenser, and then the enlarged outline of the object is projected to the projection screen through the objective lens. According to the need, the instrument is a single projection lighting, the light source is projected on the work table through a series of optical elements, and then through a series of optical elements the test sample notch is clearly projected on the projector. The object is magnified and reflected twice to be positive. The figure seen on the projection screen is different from the orientation of the practical sample.
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