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The laser range of cell phone jammer is commissioned

 However, the large angle θ will bring difficulties to the lens design. F number is small, θ and f can not be large, especially in order to obtain a spot size of uniform size, often considered the telecentric optical system. The laser range of cell phone jammer is commissioned.Its role is to print on paper and toner charge in the adsorption and eliminate the polarity so that it was neutral, physically attached to the print paper, in order to ensure the accuracy of the fuser before the toner image. 
If the scan angle and focal length are larger, the lens also, manufacturing difficulties. The aperture of the lens may move the range of the measuring range, the measured vibration amplitude as well as the center of the selection set. Meanwhile, in order to form a good parallel optical scanning, and hope that the optical system relative aperture D / f is as small as possible, but 11 Huazhong University of Science and Technology the Wenhua graduation design (thesis) is the focal length is too large will increase in size of the probe, it is generally relative aperture D / f 1/4 to 1/6. 3.3 The scanning receiving optical system in the rotary diameter measurement system, design the focusing lens as scanning receiving optical system, optical receiver placed in the back focal plane of the scanning receiving optical system. It is independent on the total output power of cell phone jammer .
Know the nature of the lens, parallel light through the lens convergence point is not an ideal point, but a diffraction spot diameter d = 1.22 f λ is converging lens focal length, f; λ is the D laser wavelength; is the diameter of the laser beam. It can be seen from the above equation: f the smaller, the smaller d. So to design a short focal length converging lens as a scanning receiving optical system. 3.4 3.4.1 polyhedral mirror scanning device to select laser scanning regardless of which way we need to have optical scanners. Galvanometer scanning to implement this feature, sound and light scanning, electro-optical scanning and polyhedral rotating mirror scanning. Polyhedron turn the shortcomings of the scanning. Polyhedral machining accuracy requirements; Strict uniformity of the scanning motor. For example, the red laser beam light is emitted by the red phone jammer .