Mouse DarkField Technology

Recently, my Logitech mouse broke down after it expired, and it was very depressing. My master recently bought a very good Logitech mouse m905. At that time, he showed me how to use the mouse on the glass, which surprised me. Although the function is strong, the price is also frightening. For these reasons, I am interested in the mouse, especially the latest Logitech 09 technology "unbounded" and "".

Logitech, which has the unique technology of "umeng", can easily play with six wireless devices at home, office, and on the road with only one nano receiver, however, you can still understand the principles. "Unbounded" makes me feel amazing. In the past, when the Optical Mouse touched the glass surface, it was dumb, and now it can still be on transparent glass or disc. So I studied its principle.

First, let's review the principle of the Optical Mouse.

There are two types of optical and mouse available on the market: Common optics and laser. The laser engine uses a laser diode to replace the light emitting diode in the optical engine. The design and working principles of the two are basically the same. We can understand the working principle of the mouse through diagrams and instructions. The top right of the figure is a two-pole luminous tube, which illuminates the moving surface and then is like a film, the optical viewfinder records the moving area at a speed of several thousand frames per second (in the black box), and then determines the moving direction and distance of the mouse based on the difference between the two recorded images. However, when the two images used for comparison cannot provide sufficient details due to problems of the light source or moving plane, the mouse cannot determine the moving direction and distance, leading to optical failure.

The following is an analysis of Logitech's "unbounded" technology. In fact, his name is darkfield technology. Because it is a new technology, domestic articles are all about how this technology works, the following is an introduction to it on a foreign network, which has benefited me a lot (I will translate it if I have time)

Fine Structures can often not be seen in front of a bright background. this situation changes if the structures are illuminated from the side and viewed in front of as dark a background as possible. the structures then really seem to light up.

Fine structures become visible: The spider webs (left) are barely recognizeable in front of the bright background-a light green field in this case. the picture completely changes when a dark background-a dark forest-is chosen. the structure seems to light up (right ). in both cases, the object is illuminated at an angle from above by the bright afternoon sun. however, the sunlight did not directly hit the camera; this direct illumination wowould have swamped everything else.

An artificial dark background is created in the microscope using a annular stop (1) In the condenser. Although the condenser optics (2) Then illuminates the sample (3), It does so with a hollow cone of light. The light does not hit the objective (4), But passes it by on the outside. if there is no sample, the image seen in the eyepieces remains completely dark. however, if objects, e.g. small participates of bacteria, are in the object plane, light is laterally diffracted away from the straight path. provided that this light hits the aperture cone of the objective, it is gathered by the objective and fused to form an image. the object becomes brightly visible in front of a dark background.

For this, it is necessary for the objective aperture to be smaller than the inner aperture of the illuminating light cone (Case). However, objectives with an Integrated Variable iris diaphragm (5) Are also available to shutter out the indirect light even if it falls into the aperture cone of the objective (Case B). This permits the use of very high apertures for darkfield.

The diatoms are barely visible in brightfield (left ).	This is quite different in dark field (right) where they seem to light up.

Haha, the technology is good, but it is actually flashy. Few people use the mouse directly on the glass. Besides, it is quite comfortable to have a mouse pad. So I finally decided to buy m505. After all, he was a laser mouse and had the "youlian" technology, and the price fell by half because m905 had the "unbounded" technology. Haha, I like my m505 very much. I hope it will not be too difficult if it is too warranty.