The primary improvements to metallurgical microscopy are as follows:
This is an optical system for the correction of chromatic aberration and aberration at infinity, or simply an optical system at infinity. When this optical system is used, when the incident light is reflected from the exterior of the specimen and re-enters the objective lens, it does not converge but remains as a parallel beam until it passes through the lens of the mirror barrel before converging and forming the central image, i.e., expanding the real image at once, and then only for the eyepiece to expand it again. The advantage of infinity optical system is that all kinds of optical accessories in the microscope (such as dark-field beam separator, polarised light separator, prisms for differential intervention liner), check polarizer, and other additional filters, etc.) can be placed in the objective lens flange and the mirror between the lens of the parallel beam of the space between the lens, because the image beam has not been disturbed by the above optical accessories, the quality of the object image will not be damaged, and then simplify the design of the chromatic aberration and colour difference in the design of the objective lens, and then the image will not be damaged. This simplifies the correction of chromatic aberration and aberration in the design of the objective lens. In addition, in the infinity optical system, the barrel length coefficient is maintained as one, no matter how far the distance between the objective lens and the eyepiece is, there is no need for a fixed transit lens system. At present, the German company and the company, the Japanese company and olympus company produced by Olympus metallurgical microscope have been used successively infinite far optical system design.
In the new Olympus metallurgical microscope, change the objective lens and eyepieces do not need to focus from the new, ordinary only need to slightly adjust the fine-tuning knob, you can make the object image gathered. For this reason, the objective lens and eyepiece optical mechanical dimensions should meet the requirements of the same focal plane, that is: ① all the conjugate interval of the objective lens (i.e., from the exterior of the specimen to the objective lens to expand the image of the image of the interval between the same: ② all the objective lens to expand the image of the eyepiece tube mouth interval remains unchanged; ③ all the eyepiece focal plane and the objective lens to expand the image of the image of the surface coincides with the image of the same. Isofocal plane is not an intrinsic feature of the objective lens or eyepiece, but in the design of the new microscope in order to facilitate the operation of the user to accept a method.
