How to find the patent of optical design for microscope head and camera lens?

Optical microscope usually consists of optical part, illumination part and mechanical part. There is no doubt that the optical part is the most critical, consisting of eyepiece and objective lens. As early as 1590, glasses manufacturers in the Netherlands and Italy have made magnifying instruments similar to microscopes. There are many kinds of optical microscopes, mainly including bright-field microscope (ordinary optical microscope), dark-field microscope, fluorescence microscope, phase contrast microscope, laser scanning focusing microscope, polarizing microscope, differential interference difference microscope, inverted microscope and so on. The electron microscope has similar basic structural characteristics to the optical microscope, but it has much higher magnification and resolution than the optical microscope. It uses electron flow as a new light source to image objects. Since ruska invented the first transmission electron microscope in 1938, many other types of electron microscopes have been developed besides the continuous improvement of transmission electron microscope itself. Such as scanning electron microscope, analytical electron microscope, ultra-high pressure electron microscope, etc. Combined with various electron microscope sample preparation techniques, we can study the structure of samples or the relationship between structure and function in many aspects. Microscopes are used to observe images of tiny objects. It is often used in biology, medicine and observation of tiny particles. An electron microscope can magnify an object 2 million times.