2results about How to "Small focus" patented technology

The application discloses a zoom lens, which comprises, in sequence along an optical axis from an object plane to an image plane, a focusing lens group, a diaphragm and a zoom lens group; the focusing lens group and the zoom lens group are arranged to be movable along the optical axis direction; the focusing lens group has negative optical power, and the zoom lens group has positive optical power; in the zoom lens, the number of lenses with optical power is 10; the focusing lens group comprises a first lens, a second lens and a third lens with optical power; and the zoom lens group comprises a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens with optical power. The technical scheme of the application can realize the zoom lens with small size, large aperture, full-waveband confocal in a 436nm-850nm waveband, high image quality and other excellent characteristics.

The invention provides an X-ray generating device which comprises a cathode system, a magnetic deflection system, a magnetic focusing system, an anode system and a vacuumizing system, the cathode system comprises a cathode cavity, a cathode high-voltage assembly and a high-voltage connecting assembly, and the cathode high-voltage assembly comprises a lanthanum hexaboride filament assembly; the magnetic deflection system comprises a magnetic deflection unit; the magnetic focusing system comprises a quadrupole focusing unit and a monopole focusing unit; the anode system comprises an anode target assembly, the anode target assembly comprises a transmission target, and electron beams emitted by the lanthanum hexaboride filament assembly sequentially pass through the magnetic deflection unit, the quadrupole focusing unit and the monopole focusing unit to reach the transmission target. According to the X-ray generation device, the lanthanum hexaboride lamp filament with a smaller emission plane is used as a heat emission source, the two combined focusing units are used for highly compressing the electron beam, and a high vacuum environment is provided, so that the focal point finally irradiated on the transmission target is extremely small, and the resolution ratio and the stability of the X-ray generation device are improved.