2results about How to "Reduce spot size" patented technology

The application provides a laser radar, which comprises a laser transceiver module, a correction mirror and a window, the laser transceiver module is used for emitting laser and receiving reflected laser, the laser is emitted to a measured object after sequentially passing through the correction mirror and the window, and the reflected laser formed by the measured object is incident to the laser transceiver module after sequentially passing through the window and the correction mirror; wherein the correction mirror and the window constitute a 4f system, and the 4f system is used for reducing the divergence angle and spot size of the laser and reducing the signal amplitude attenuation of the reflected laser. The laser radar provided by the application reduces the divergence angle and spot size of the laser and reduces the signal amplitude attenuation of the reflected laser by constituting a 4f system with the correction mirror and the window, so as to improve the accuracy of the detection result of the laser radar.

The application provides a myopia prevention and control lens, and relates to the technical field of optical lenses, comprising a lens piece, wherein the lens piece comprises: a plurality of microlenses, and the plurality of microlenses form a supermicrostructure region; wherein the diameter of the microlenses is 0.6 mm-0.25 mm. Through the small microlens diameter, the light spot of the defocus signal of the microlenses on the retina is smaller than the range that can be recognized by the human eye, so that the imaging quality is improved, and the prevention and control effect is improved.