Introduction to the Mechanical Components of Metallurgical Microscopes
1. The mirror holder is the base of the entire metallographic microscope. It is usually horseshoe shaped or rectangular, used to support the smoothness of the entire mirror body. Some microscopes are equipped with illumination devices inside the mirror holder.
2 . The mirror post is the upright part above the mirror holder, used to connect and support the mirror arm.
3 . The mirror arm is the curved part of the mirror column facing upwards. Some microscopes held during use have a movable joint called the tilt joint between the mirror arm and the mirror holder. The mirror can be tilted backwards for easier observation.
4. A cylindrical tube connected to the front of the mirror arm, generally 160mm in length. Some tubes are fixed and immovable, while others can move up and down. An eyepiece is installed at the upper end of the tube, and an objective converter is connected at the lower end.
5. The adjuster is a spiral of two sizes installed on the mirror arm or column. When rotated, it can move the lens barrel or stage up and down to adjust the distance between the objective lens and the specimen, that is, to adjust the focal length. When the coarse adjustment screw rotates, the range of up and down movement is large, which can quickly adjust the distance between the objective lens and the specimen to present the object image in the field of view. When the fine adjustment screw rotates, the amplitude of up and down movement is small. Generally, on the basis of using the coarse adjustment screw for focusing or when using a high-power lens, it is used for comparative adjustment to obtain a completely clear object image and to observe the structure of the specimen at different levels and depths.
6. The objective lens converter (rotating disc) is connected to a freely rotatable disc at the lower end of the lens barrel, with 3-4 circular holes. The objective lens is mounted in these circular holes, and rotating the rotating disc can exchange different magnification ratios of the objective lens. When the objective lens is rotated to the working position (i.e. aligned with the optical axis), it is necessary to fasten the notch on the edge of the rotating disc to the fixed buckle on the base, otherwise the specimen cannot be observed.
7. The metallographic microscope stage is a square or circular platform located below the lens barrel, used to place glass slide specimens. There is a circular light hole in the center of the platform, through which light from below shines onto the specimen. The stage is equipped with a specimen pusher, and the curved spring clip on the left side is used to fix the specimen. By rotating the two screws on the right side, the specimen can be moved forward, backward, left, and right. Some thrusters also have scales on them, which can calculate the distance traveled by the specimen and determine its position.
